Urticaria First Aid: When Adrenaline, Ambulance, and Hospitalization Are Needed

Urticaria itself most often presents with itchy wheals and sometimes angioedema, that is, deep swelling of the skin or mucous membranes. If only the skin is affected—itchy wheals, redness, limited swelling of the lips or eyelids without difficulty breathing or weakness—this is usually not anaphylaxis, but the patient should still monitor the progression. Current guidelines describe urticaria as a mast cell disorder, which can present with wheals, angioedema, or a combination of both. [1]

The situation becomes urgent if skin manifestations are combined with signs of respiratory, circulatory, or mental impairment, or severe gastrointestinal symptoms. Dangerous symptoms include shortness of breath, wheezing, hoarseness, a feeling of swelling in the throat, swelling of the tongue, difficulty swallowing, sudden weakness, dizziness, fainting, a drop in blood pressure, repeated vomiting, or severe abdominal pain. In such cases, it may not just be hives, but anaphylaxis—a systemic allergic reaction for which adrenaline is the first-line treatment. [2]

The main mistake in emergency care is trying to "wait for the antihistamine to work" when respiratory or vascular symptoms are already present. Antihistamines can reduce itching and skin symptoms, but they do not treat airway swelling, bronchospasm, low blood pressure, or shock. Therefore, if signs of anaphylaxis appear, intramuscular epinephrine and an ambulance should be administered first, rather than allergy pills as the sole measure. [3]

If a person already knows they have had anaphylaxis, has a prescribed epinephrine autoinjector, and develops signs of a severe reaction, the autoinjector is used immediately according to a physician's individual plan. After epinephrine administration, a medical evaluation is still necessary because symptoms may return, the reaction may progress, and some patients require a repeat dose and observation. New guidance from the National Institute for Health and Care Excellence, issued May 27, 2026, specifically addresses evaluation, observation, hospitalization, and referral to an allergist after suspected anaphylaxis. [4]

If a patient only has itchy wheals without shortness of breath, tongue swelling, weakness, fainting, or a drop in blood pressure, care is usually structured differently: stopping contact with the likely trigger, administering a modern second-generation antihistamine, observing, and contacting a doctor if worsening occurs. Royal Children's Hospital guidelines indicate that most patients with common urticaria do not require hospitalization if anaphylaxis is ruled out. [5]

Situation	Probable estimate	Action
Just itchy blisters	Most often, common acute urticaria	Antihistamine and observation
Blisters plus swelling of the lips or eyelids without respiratory symptoms	Urticaria with angioedema	Medical assessment, especially if recurring
Swelling of the tongue, throat, hoarseness	Risk of airway edema	Call an ambulance immediately
Shortness of breath, wheezing	Possible anaphylaxis	Adrenaline on schedule and emergency aid
Fainting, weakness, drop in blood pressure	Possible anaphylactic shock	Immediate emergency care

First steps at home or before the ambulance arrives

The first step is to stop contact with the potential trigger, if feasible and safe to do so. Stop administering the suspected drug, stop eating, remove the insect stinger, and move away from latex, chemicals, cold, heat, or other obvious triggers. This does not replace treatment, but it does reduce further exposure to the irritant. [6]

If signs of anaphylaxis are present, the person should not be forced to stand, get into a car, or drive to the hospital. Anaphylaxis guidelines emphasize: the patient should be kept lying down, not allowed to stand or walk, and if breathing is difficult, a sitting position with legs extended, not on a chair, and under observation, may be permitted. Sudden standing during anaphylaxis can impair venous return to the heart and exacerbate the drop in blood pressure. [7]

If the patient has a doctor-prescribed adrenaline autoinjector, it should be administered immediately upon signs of anaphylaxis. Adrenaline should be injected intramuscularly into the outer mid-thigh, not subcutaneously or into the buttock. If severe respiratory or vascular symptoms do not improve, a repeat dose may be required in approximately 5 minutes, according to the emergency protocol. This is especially important in the presence of throat swelling, bronchospasm, a drop in blood pressure, or deterioration in consciousness. [8]

An ambulance should be called immediately, even if the reaction improves after adrenaline. Improvement may be temporary, and some reactions require a repeat dose, oxygen, intravenous fluids, observation, and subsequent referral to a specialist. The Resuscitation Council UK guidelines recommend that patients with suspected anaphylaxis should be referred to a specialist allergy service, and an adrenaline autoinjector and action plan may be required pending specialist assessment. [9]

If there are no signs of anaphylaxis, a modern second-generation antihistamine can be taken at an age-appropriate dose. Avoid overheating, alcohol, intense physical activity, and repeated exposure to the suspected trigger. In children, doses should be appropriate for age and body weight. For severe acute urticaria that does not respond to an antihistamine, a physician may consider a single short course of a systemic glucocorticosteroid, but this is not the first line of treatment for anaphylaxis. [10]

Step	If there is only skin urticaria	If there are signs of anaphylaxis
Remove trigger	Yes, if possible	Yes, if possible
Body position	Comfortable, no overheating	Lie down, don't get up, don't walk
Antihistamine	It can be the basis of help	Only as a supplement, not instead of adrenaline
Adrenalin	Usually not needed on one skin	Needed immediately according to plan
Ambulance	In case of deterioration or swelling of dangerous areas	Necessarily
Observation	Monitor breathing, voice, weakness	Medical supervision is mandatory

How to distinguish between regular hives and anaphylaxis

Common acute urticaria is usually limited to the skin: the wheals are itchy, appear and disappear, and can migrate across the body, sometimes accompanied by limited swelling of the eyelids or lips. The person breathes, speaks, and swallows normally, does not turn pale, does not faint, and does not exhibit significant weakness or signs of shock. In this situation, treatment usually begins with an antihistamine and observation. [11]

Anaphylaxis is not a "very severe rash," but a systemic reaction. Skin manifestations may be present, but sometimes they are absent; the Resuscitation Council UK states that skin or mucosal changes may be absent in up to 20% of cases of anaphylaxis. Therefore, the absence of wheals does not rule out anaphylaxis if respiratory or vascular symptoms are present after exposure to a probable allergen. [12]

Changes in breathing are especially concerning: wheezing, persistent cough, chest tightness, shortness of breath, noisy breathing, hoarseness, a feeling of tightness in the throat, swelling of the tongue, or inability to swallow properly. The Emergency Care Institute guidelines specifically state: if a person with known allergies or asthma suddenly develops breathing problems after eating, being bitten, or taking medication, intramuscular epinephrine should be given before a bronchodilator, even if there are no skin symptoms. [13]

Vascular signs of anaphylaxis include sudden weakness, dizziness, blurred vision, fainting, cold sweat, pallor, confusion, and a drop in blood pressure. With these symptoms, you shouldn't expect pills to be effective, as the problem isn't just skin-related, but systemic vasodilation, fluid redistribution, and circulatory impairment. [14]

Gastrointestinal symptoms are also significant if they occur along with a skin reaction or after exposure to a potential allergen. Repeated vomiting, severe abdominal pain, cramping, and a sudden deterioration in condition may be part of anaphylaxis, especially if accompanied by hives, swelling, respiratory symptoms, or weakness. [15]

Sign	Looks more like regular hives	Looks more like anaphylaxis
Leather	Itchy blisters	Blisters may or may not be present.
Breath	Normal	Shortness of breath, wheezing, coughing, hoarseness
Throat and tongue	No swallowing disorder	Swelling of the tongue, throat, difficulty swallowing
Pressure and consciousness	Stable condition	Weakness, fainting, drop in blood pressure
Gastrointestinal symptoms	Usually there are no severe manifestations	Repeated vomiting, severe abdominal pain
Tactics	Antihistamine and observation	Adrenaline and first aid

Adrenaline: When is it needed and why it shouldn't be replaced with pills?

Adrenaline, or epinephrine, is the first-line drug for anaphylaxis. It constricts blood vessels, reduces swelling of the airway mucosa, dilates the bronchi, supports cardiac function, and inhibits further release of mediators from mast cells. Therefore, if respiratory, vascular, or life-threatening signs of an allergic reaction occur, adrenaline should be used first. [16]

Intramuscular administration into the outer mid-thigh is considered the standard for emergency treatment of anaphylaxis. ASCIA recommends a dose of 0.01 milligrams per kilogram of body weight, up to a maximum of 0.5 milligrams per dose, while the Resuscitation Council UK provides age-specific doses for healthcare professionals and emphasizes that a repeat dose is needed after approximately 5 minutes if respiratory or vascular problems persist. For untrained patients, it is safer to use a prescribed autoinjector according to a personalized plan rather than ampoules and syringes. [17]

Antihistamines are not a substitute for adrenaline in anaphylaxis. They may reduce itching and urticaria, but do not eliminate bronchospasm, upper airway swelling, hypotension, or shock. The Resuscitation Council UK guidelines clearly state that antihistamines are not recommended as part of the initial emergency treatment for anaphylaxis and should not be used in conjunction with adrenaline and intravenous fluids for respiratory or vascular symptoms. [18]

Systemic glucocorticosteroids should also not be used instead of epinephrine. ASCIA states that the benefit of corticosteroids in anaphylaxis has not been proven as a first-line treatment, and their use should not replace epinephrine. They may be considered by physicians as an additional measure in certain situations, such as persistent bronchospasm or severe exacerbation, but not as an immediate rescue measure for anaphylaxis. [19]

Intravenous epinephrine is not a home remedy or a standard for untrained personnel. Guidelines emphasize that intravenous epinephrine should only be administered by specialists skilled in titrating vasopressors, under monitoring, because the risk of severe complications from improper intravenous administration is significantly higher. In a typical emergency, intramuscular epinephrine remains the first step. [20]

Preparation	Role in common urticaria	Role in anaphylaxis
Adrenalin	Usually not needed on one skin	First line for respiratory or vascular symptoms
Second-generation antihistamine	The main remedy for skin symptoms	Just a supplement, does not help with breathing and blood pressure
Bronchodilator	Not needed for one skin	It may help with bronchospasm, but not as a substitute for adrenaline.
Systemic glucocorticosteroid	Sometimes briefly for severe urticaria as decided by the doctor	Not the first line, shouldn't hold adrenaline
Intravenous fluid	Usually not needed	Important in shock and hypotension in medical settings
Intravenous adrenaline	Not applicable at home	Only by specialists for refractory anaphylaxis

What do emergency room and emergency room doctors do?

Emergency room and emergency department physicians assess the patient based on the airway, breathing, circulation, neurological status, and a full skin examination. This approach is necessary because in anaphylaxis, it is not the blisters themselves that pose a life-threatening risk, but rather the airway swelling, bronchospasm, drop in blood pressure, and shock. The Resuscitation Council UK specifically recommends this systematic approach and treating life-threatening signs immediately. [21]

If anaphylaxis is suspected, medical care includes intramuscular epinephrine, oxygen, monitoring of oxygen saturation, blood pressure, and heart rate, and, if hypotension occurs, intravenous fluid administration. If respiratory or circulatory problems persist after two correct doses of intramuscular epinephrine, the reaction is considered refractory anaphylaxis and requires early involvement of specialists for intensive care and possible intravenous epinephrine infusion. [22]

In cases of persistent bronchospasm, physicians may add bronchodilators, such as salbutamol, but these should not replace epinephrine. Severe upper airway edema may require nebulized epinephrine and airway preparation. These measures are considered a medical step and require experience, equipment, and supervision. [23]

Following a suspected anaphylaxis, a patient may require observation in a medical facility. The new 2026 National Institute for Health and Care Excellence guidelines include specific recommendations on the duration of observation, indications for hospitalization, documentation of the episode, discharge, and referral to a specialized allergy service. This is important because patient safety does not end with the resolution of the rash. [24]

If anaphylaxis is excluded and the patient has simple acute urticaria, hospitalization is often not required. The Royal Children's Hospital guidelines state that discharge is possible when anaphylaxis is excluded, and most patients with urticaria do not require hospitalization. However, consultation is necessary if angioedema, age under 6 months, chronic urticaria, fever, bruising, joint pain, or other systemic symptoms are present. [25]

Help stage	What is being assessed?	For what
Respiratory tract	Tongue, throat, voice, swallowing	Don't miss swelling of the larynx
Breath	Shortness of breath, wheezing, saturation	Detect bronchospasm and hypoxia
Circulation	Pulse, pressure, weakness	Reveal shock
First-line treatment	Intramuscular adrenaline	Stop anaphylaxis
Additional measures	Oxygen, fluid, bronchodilators	Maintain breathing and circulation
After stabilization	Observation, discharge, referral	Prevent recurrence of risk

Emergency care for common acute urticaria without anaphylaxis

If only skin blisters, itching, and redness are present, and breathing, voice, swallowing, blood pressure, and consciousness are normal, treatment usually begins with a second-generation antihistamine. These medications include cetirizine, levocetirizine, loratadine, desloratadine, fexofenadine, bilastine, and others in this group. International guidelines on urticaria consider modern second-generation antihistamines to be the mainstay of treatment for urticaria. [26]

For children, the choice and dosage depend on age and body weight. Royal Children's Hospital lists age-specific doses of cetirizine and indicates that for chronic urticaria, the dose can be increased up to four times the recommended dose under medical supervision if symptoms persist. This does not mean parents should increase the dose themselves: a child with severe swelling, worsening condition, or chronic symptoms should consult a doctor. [27]

Older sedating antihistamines are not the optimal choice for many patients, especially children, the elderly, drivers, and those who require concentration. Drowsiness and lethargy can interfere with judgment and sometimes mask deterioration. In anaphylaxis, the ASCIA also warns that oral sedating antihistamines should not be used as an emergency substitute for epinephrine, and the injectable promethazine form may worsen hypotension. [28]

Topical hormonal ointments are generally ineffective for urticaria. This is because urticaria is associated with a rapid vascular reaction and mast cell mediators, rather than superficial skin inflammation, as with some dermatitis. Pediatric clinical guidelines explicitly state that steroid creams are ineffective for urticaria. [29]

A short course of systemic glucocorticosteroids is sometimes considered for severe urticaria that does not respond to antihistamines, but this is a physician's decision and not standard home first aid. A 2026 update of international guidelines, as reported by the British Society of Allergy and Clinical Immunology, reiterates the avoidance of long-term systemic glucocorticosteroids and their restriction to short rescue courses for severe exacerbations. [30]

Situation	What can be done?	What cannot be considered sufficient
Just itchy blisters	Second-generation antihistamine	Adrenaline without signs of anaphylaxis is usually not needed.
Severe itching	Cooling the skin, avoiding overheating, antihistamine	Combing and a hot shower
Swelling of the lips without respiratory symptoms	Observation and medical evaluation in case of recurrence	Ignore rapid swelling growth
Severe urticaria without anaphylaxis	Your doctor may consider a short course of systemic hormone replacement therapy.	Taking hormones for a long time
Chronic symptoms	Planned assessment and step-by-step treatment	Always get emergency treatment only

Children, pregnant women and people with chronic diseases

In children, acute urticaria is often associated with a viral infection, so not every episode indicates a food allergy. However, a child with urticaria requires urgent evaluation if there are respiratory symptoms, swelling of the tongue or throat, lethargy, fainting, repeated vomiting, severe weakness, age under 6 months, angioedema, or systemic signs such as fever, bruising, and joint pain. [31]

For anaphylaxis in children, the principle is the same as for adults: epinephrine administered intramuscularly into the outer mid-thigh is the first line of treatment. ASCIA recommends a dosage of 0.01 milligrams per kilogram to 0.5 milligrams per dose and separately specifies autoinjector options by weight, including 150 micrograms for children weighing between 7.5 and 20 kilograms, according to professional assessment. In practice, this means that a high-risk child requires a pre-prescribed autoinjector and parental training. [32]

Pregnancy is not a reason to delay epinephrine administration in anaphylaxis. ASCIA specifically states that the management of anaphylaxis in pregnant women is the same as in non-pregnant women, and epinephrine remains the first-line treatment and should not be delayed due to concerns about reducing placental blood flow. During pregnancy, the left lateral position is also recommended to improve venous return. [33]

People with asthma are at higher risk for a severe allergic reaction, especially if sudden breathing problems occur after food, medication, or an insect bite. The Emergency Care Institute emphasizes that if a person with known asthma and allergies experiences a sudden breathing problem, epinephrine should be given before a bronchodilator, even if there is no skin rash. This is important because bronchodilators do not treat swelling of the upper airways or a drop in blood pressure. [34]

In elderly patients and those with cardiovascular disease, fear of epinephrine often leads to dangerous delays. Guidelines indicate that a properly administered intramuscular dose of epinephrine is generally well tolerated, while delayed treatment of anaphylaxis is associated with severe and fatal outcomes. However, intravenous epinephrine does require specialist supervision and monitoring, so it is important not to confuse the safe, standard intramuscular route with the risk of inappropriate intravenous use. [35]

Group	Peculiarity of risk	Rule of thumb
Children	Infectious urticaria is common, but the risk of anaphylaxis remains	Assess breathing, consciousness, swelling of the tongue and throat
Babies	It is more difficult to recognize the symptoms	A low bar is needed for seeking medical attention.
Pregnant women	Risk to mother and fetus if treatment is delayed	Adrenaline should not be delayed in case of anaphylaxis
Patients with asthma	Respiratory symptoms can progress rapidly.	Adrenaline before bronchodilator for anaphylaxis
Elderly patients	More concomitant diseases and medications	Do not withhold intramuscular adrenaline in case of life-threatening symptoms.

After the episode: what to do to prevent it from happening again is dangerous

After a severe reaction, it is important to record what happened: time of onset, food, medications, bites, exercise, alcohol, infection, stress, new cosmetics, latex, contrast media, and other exposures in the past hours. ASCIA recommends documenting episodes of anaphylaxis because it helps identify treatable causes and associated factors, including food, medications, herbs, bites, and exercise. [36]

A patient with suspected anaphylaxis should be referred to an allergy specialist. NICE 2026 includes referral to a specialist allergy service in its post-emergency treatment guidelines, and the Resuscitation Council UK states that all patients following anaphylaxis should be referred for allergy assessment. This is not a formality, but rather to identify the cause, educate, and prevent a recurrence of a severe reaction. [37]

Before consulting a specialist, the patient may require an adrenaline autoinjector and a written action plan. The Resuscitation Council UK advises that patients after suspected anaphylaxis should be offered an adrenaline autoinjector as a temporary measure until allergy assessment if the reaction was not drug-related, and should be taught how to use the autoinjector and an emergency action plan. [38]

If episodes are limited to the skin but recur for more than 6 weeks, it is no longer simply an "acute allergy" but rather chronic urticaria. The International Urticaria Guidelines divide the disease into acute and chronic based on a 6-week limit and describe chronic urticaria as a condition that can significantly impair quality of life and require stepwise treatment. [39]

If swelling recur without wheals, especially if it affects the abdomen, tongue, or throat, or if it responds poorly to antihistamines, hereditary, acquired, or drug-induced angioedema should be considered. The World Allergy Organization's 2025 guidelines for hereditary angioedema emphasize that this is a rare but potentially life-threatening condition that requires separate diagnosis and treatment from that of common urticaria. [40]

After the episode	Why is it necessary?	Who helps?
Write down the circumstances	Find the trigger and associated factors	Patient, doctor
Save a photo of the rash and swelling	Help with diagnosis	Patient
Get a referral to an allergist	Clarify the cause and risk of recurrence	Emergency physician, therapist, pediatrician
Discuss autoinjector	Protect the patient until a full examination is completed	Allergist or doctor after an emergency episode
Check for chronic course	Symptoms lasting more than 6 weeks require a different strategy.	Dermatologist, allergist
Rule out other angioedema	Swelling without blisters is treated differently	Allergist-immunologist

Common mistakes in emergency care

The first mistake is to assume that all urticaria is equally dangerous. In fact, isolated itchy hives are usually treated with an antihistamine and observation, not epinephrine. But if respiratory or vascular symptoms appear, the situation changes: this is a possible anaphylaxis, and epinephrine should not be delayed. [41]

The second mistake is using an antihistamine as the "first line of defense" for anaphylaxis. Antihistamines help the skin, but they do not treat laryngeal swelling, bronchospasm, shock, or a drop in blood pressure. The Resuscitation Council UK and ASCIA emphasize that antihistamines should not delay adrenaline production and do not treat the respiratory or cardiovascular manifestations of anaphylaxis. [42]

The third mistake is administering systemic glucocorticosteroids instead of epinephrine. Corticosteroids act slowly and are not the first line of treatment for anaphylaxis. ASCIA explicitly states that their benefit in anaphylaxis has not been proven as a primary measure, and international guidelines on urticaria limit systemic corticosteroids to short-term rescue courses for severe exacerbations, not as a long-term strategy. [43]

The fourth mistake is allowing a person with anaphylaxis to walk, stand, sit in a regular chair, or drive themselves to the hospital. Guidelines warn that a sudden change in position can impair circulation and lead to a fatal outcome. The patient should lie down, and if breathing is uncomfortable, sit only with the legs extended, with immediate return to a lying position if weakness or deterioration in consciousness occurs. [44]

The fifth mistake is doing nothing after improvement. Even if the urticaria and swelling have resolved, a suspected anaphylaxis requires a plan: observation, documentation, referral to an allergist, education, consideration of an autoinjector, and prevention of re-exposure to the likely trigger. NICE 2026 and the Resuscitation Council UK specifically highlight assessment and referral after an acute episode. [45]

Error	Why is it dangerous?	The right tactics
Wait for the tablet to take effect if you experience shortness of breath.	You can lose time with anaphylaxis	Adrenaline and first aid
Use a hormone instead of adrenaline	The hormone acts slowly.	Adrenaline first line
Let the patient get up and walk	The pressure drop may increase	Put down, don't let him walk
Ignore symptoms without a rash	Anaphylaxis can occur without skin irritation.	Assess breathing and circulation
Do not refer to an allergist	Risk of recurrent severe reaction	Prevention plan and examination
Treat chronic urticaria only in an emergency.	The disease remains uncontrolled	Stepwise planned therapy

FAQ

When should you call emergency medical help for hives? Emergency medical help should be called if you experience swelling of the tongue or throat, hoarseness, difficulty breathing, wheezing, fainting, sudden weakness, a drop in blood pressure, confusion, repeated vomiting, or a rapid deterioration in your condition. These signs may indicate anaphylaxis or dangerous angioedema. [46]

If there are only wheals and itching, is epinephrine necessary? Usually not, unless there are respiratory, vascular, or other systemic danger signs. For isolated cutaneous urticaria, first aid is usually a second-generation antihistamine and observation, but if the condition worsens, the approach changes. [47]

Why is an antihistamine not appropriate as first aid for anaphylaxis? Because it does not address airway swelling, bronchospasm, hypotension, or shock. Guidelines indicate that antihistamines can treat skin symptoms but should not delay epinephrine administration for respiratory or vascular manifestations. [48]

Where is adrenaline administered for anaphylaxis? The standard route is intramuscularly into the outer mid-thigh. This applies to both autoinjectors and medical injections; intravenous adrenaline is used only by specialists under monitoring conditions for severe refractory anaphylaxis. [49]

Can a bronchodilator be given for wheezing? A bronchodilator can be an adjunctive measure for bronchospasm, but it is not a substitute for epinephrine in anaphylaxis. If a person with a known allergy suddenly develops breathing problems after eating, medication, or being bitten, recommendations recommend giving intramuscular epinephrine before the bronchodilator. [50]

Do hormones help with acute urticaria? For severe urticaria without anaphylaxis, a doctor may sometimes consider a short course of systemic glucocorticosteroids, but in anaphylaxis, hormones are not the first line of treatment and should not be used with epinephrine. Long-term use of systemic hormones for chronic urticaria is not recommended. [51]

Do I need to go to hospital after using an adrenaline autoinjector? Yes. Even if I feel better, I need a medical assessment because the reaction may recur or require further treatment and observation. NICE 2026 specifically addresses observation, admission, discharge, and referral after suspected anaphylaxis. [52]

What should you do if hives recur for more than 6 weeks? This could indicate chronic hives, not just a one-time acute episode. A routine evaluation by a doctor is needed, along with determination of the type of hives and gradual treatment, rather than a constant reliance on emergency pills. [53]

When does swelling associated with urticaria require separate diagnosis? If swelling recur without wheals, does not respond well to antihistamines, or affects the abdomen, tongue, or throat, other types of angioedema, including hereditary, acquired, and drug-induced, should be ruled out. These conditions are treated differently than typical urticaria. [54]

Can I simply avoid all allergens after hives? No. After a severe reaction, I need to identify a specific potential trigger and associated factors, rather than banning everything. Documenting the episode and consulting an allergist can help determine the actual risk and develop a sound prevention plan. [55]

Key points from experts

Dr. Victoria Cardona, an allergist and lead author of the World Allergy Organization's guidelines on anaphylaxis, said: Intramuscular epinephrine remains the first-line treatment for anaphylaxis, but in real-world practice, it is often underused or used too late. For a patient with urticaria, this means a simple rule: skin alone is one thing, but skin plus breathing, weakness, or a drop in blood pressure are all reasons to act as if anaphylaxis were possible. [56]

Professor Andrew F. Whyte, MD, co-author of the Resuscitation Council UK clinical guidelines for the emergency treatment of anaphylaxis, states: Treatment should begin with an assessment of the airway, breathing, and circulation, and intramuscular adrenaline should be administered early in the event of life-threatening signs. Intravenous adrenaline should remain a specialist and monitoring measure. [57]

Professor Torsten Zuberbier, a dermatologist and allergist and lead author of international guidelines on urticaria, says: Urticaria is a mast cell disease with wheals, angioedema, or both, but emergency management depends not on the amount of rash but on the presence of signs of anaphylaxis. For common chronic urticaria, stepwise therapy and disease control are important, rather than endless emergency courses. [58]

Australasian Society of Clinical Immunology and Allergy: Epinephrine should be administered intramuscularly into the outer mid-thigh without delay in anaphylaxis, and bronchodilators, antihistamines, and corticosteroids should not be substituted for it as a first-line treatment. This is especially important in cases of sudden shortness of breath in a person with known allergies or asthma.[59]

The practical conclusion of international guidelines: emergency care for urticaria is based on risk triage. Isolated wheals require antihistamine and observation, urticaria with swelling of the danger zones requires medical evaluation, and urticaria with shortness of breath, hoarseness, weakness, fainting, or a drop in blood pressure requires epinephrine and emergency care. [60]