Cough: When Treatment Is Necessary and When Observation Is Enough

Cough is an innate protective mechanism that clears the airways of mucus, particles, and irritants. Cough duration is conventionally classified as acute (up to 3 weeks), subacute (3 to 8 weeks), and chronic (more than 8 weeks) in adults. In children, chronic coughs are more often considered to last more than 4 weeks. This classification helps identify probable causes and determine the scope of testing. [1]

In most cases, acute cough is associated with a viral upper respiratory tract infection and resolves spontaneously without specific treatment. The primary goal of treatment is to alleviate symptoms, restore sleep and daily activities, and not to suppress the protective reflex at any cost. Prescribing antibacterial medications for a typical cough provides no benefit and leads to undesirable effects. [2]

An important principle: "treat the underlying cause, not just the cough." In subacute and chronic cases, post-infectious changes, asthma, eosinophilic bronchitis, postnasal drip syndrome, gastroesophageal reflux disease, and angiotensin-converting enzyme inhibitor use are often detected. Therefore, with persistent symptoms, a step-by-step diagnosis is advisable. [3]

Modern concepts include the concept of "cough reflex hypersensitivity," where even mild stimuli trigger a disproportionately strong cough. This explains some cases of refractory chronic cough and guides treatment choices, including behavioral interventions and new targeted drugs. [4]

Should you "treat" a cough caused by a common cold?

For uncomplicated acute coughs, gentle self-care measures are sufficient: warm drinks, rest, humidification, nasal rinsing with isotonic solutions, and honey for children over 1 year of age and adults. These approaches improve comfort and sleep, and some have a moderate evidence base. [5]

Antibiotics are not indicated for acute cough associated with a cold. They are considered only in people with a high risk of bacterial complications, severe systemic illness, or signs of pneumonia. This approach reduces the risk of unnecessary prescriptions and drug resistance without worsening outcomes. [6]

Over-the-counter cough suppressants and expectorants provide modest or inconsistent benefits. Guidelines allow short-term symptomatic use of individual molecules in adolescents and adults, but emphasize the limited benefit and the need for realistic expectations. [7]

Codeine and other opioids are not recommended for acute cough due to their unfavorable benefit profile and risk of adverse effects, especially in children and adolescents. Non-pharmacological and safer options are warranted in most mild cases. [8]

Table 1. When to treat actively and when to observe in acute cough

Situation	Tactics	Justification
Mild cold symptoms, without shortness of breath or high fever	Self-help, symptomatic treatment	High probability of viral etiology and self-limitation
Risk of complications or systemic disease	Consider examination and antibacterial therapy as indicated	Reducing the risk of adverse outcomes in vulnerable groups
Suspected pneumonia	Urgent in-person assessment, diagnostics	Antibacterial therapy if confirmed
Lack of improvement, worsening symptoms	Re-evaluation	Search for another cause or complication
Based on clinical guidelines. [9]

Red flags and when to seek medical attention

Red flags include shortness of breath at rest, oxygen saturation below normal with a pulse oximeter, chest pain, blood in the sputum, persistent high fever, severe weakness, dehydration, and wheezing. The appearance of such signs requires an in-person assessment. [10]

In adults, a cough lasting more than 8 weeks, in children more than 4 weeks, as well as recurring nocturnal attacks, wheezing, weight loss, and sleep and eating disturbances are considered indications for seeking medical attention. In these cases, there is a high probability of an underlying condition requiring targeted treatment. [11]

People with risk factors should respond earlier. These include older age, chronic heart and lung disease, immunocompromised conditions, and pregnancy. If shortness of breath or chest pain develops, an unscheduled consultation is necessary. [12]

In acute symptoms, it is advisable to focus on the overall dynamics over 2 or 3 days. Worsening or the appearance of new alarming signs is a reason to reconsider the tactics and expand the examination. [13]

Table 2. Red flags for coughing

Sign	Possible reasons	What to do
Shortness of breath at rest	Pneumonia, asthma, thromboembolism	See a doctor immediately
Blood in sputum	Inflammation, damage to the respiratory tract	In-person diagnostics
Chest pain	Pneumonia, pleurisy, and other pathologies	Urgent assessment
Fever for more than 3 days or return of fever	Bacterial complication	Examination and tests as indicated
Weight loss, night sweats, lasting more than 8 weeks in adults	Chronic diseases, oncological alertness according to indications	Step-by-step diagnostics
Summary of manuals. [14]

How to understand the causes by duration: from acute to chronic

Acute cough is most often caused by a viral upper respiratory tract infection. Subacute cough is often post-infectious and gradually subsides, although it may persist for several weeks due to inflammatory bronchial hyperreactivity. These situations usually do not require extensive diagnostics in the absence of alarming signs. [15]

Chronic cough in adults is most often associated with asthma, eosinophilic bronchitis, postnasal drip, and gastroesophageal reflux disease. Evaluation begins with a thorough history, physical examination, baseline tests, and a review of medications, including discontinuing angiotensin-converting enzyme inhibitors if present.[16]

Chest X-ray is the primary imaging test in chronic cases. Spirometry and, if indicated, a bronchodilator test help identify asthma, while allergy evaluation and nasal therapy confirm the role of the upper respiratory tract. [17]

If the cause is not confirmed with targeted therapy and the cough persists, refractory chronic cough is considered against the background of hypersensitivity of the cough reflex and special treatment methods are selected. [18]

Table 3. Most common causes by duration

Duration	The most probable reasons	Basic steps
Up to 3 weeks	Viral upper respiratory tract infection	Self-help, observation
From 3 to 8 weeks	Post-infectious cough	Observation, inhalation agents as indicated
More than 8 weeks in adults	Asthma, eosinophilic bronchitis, postnasal drip, gastroesophageal reflux disease, angiotensin-converting enzyme inhibitor effects	Diagnosis and treatment of the cause
According to international recommendations. [19]

What really helps symptomatically?

Honey can reduce nighttime coughing and improve sleep by several points on subjective scales in children over 1 year of age and in adults, compared to placebo or no treatment. The effect is small to moderate, but reproducible, and its use in infants is prohibited due to the risk of botulism. [20]

Pelargonium in the form of a standardized extract demonstrates a moderate reduction in the severity of symptoms in acute bronchitis with good tolerability; however, the quality of the evidence is mixed and the effect is moderate. It makes sense to consider it as part of a comprehensive symptomatic treatment strategy. [21]

Guaifenesin and dextromethorphan may provide short-term relief in adolescents and adults, but overall the evidence is limited and the effect is modest. It is important to understand that these medications do not treat the underlying cause or speed recovery from viral infections. [22]

Codeine and other opioids are not recommended for the treatment of acute cough due to an unfavorable benefit-risk ratio. In pediatric patients, most combination cough suppressants are also not recommended due to a lack of proven efficacy and the risk of adverse effects. [23]

Table 4. Symptomatic cough remedies: what to expect

Means	Who should consider it?	Expected benefits	Limitations and risks
Warm drinks	Adults and children	Comfort, reduced irritation	No specific therapeutic effect
Honey	Children over 1 year old and adults	Less nighttime coughing, better sleep	Sugar should not be included in the diet for children under 1 year of age.
Pelargonium	Teenagers and adults	Moderate relief of symptoms of acute bronchitis	Heterogeneous database, rare adverse reactions
Guaifenesin, dextromethorphan	Teenagers and adults	Minor symptomatic relief	Modest benefit
Codeine	Not recommended	-	Adverse effects, unfavorable benefit-risk ratio
Summary of guidelines and systematic reviews. [24]

What to avoid: steam, oils, strong syrups

Steam inhalation over boiling water has not demonstrated convincing benefits and carries a risk of burns, especially in children. Pediatric observations and clinical publications document severe burns requiring hospitalization and surgical treatment, so this method is not recommended. [25]

Eucalyptus and camphor essential oils, as well as concentrated rubs, can cause toxic reactions, seizures if accidentally swallowed, and respiratory irritation when used excessively. The risk is particularly high in children, so such approaches should be avoided. [26]

Oil nasal drops and application of petroleum ointments to the nasopharynx increase the risk of exogenous lipoid pneumonia. This is an underestimated risk, confirmed by clinical cases, and therefore such practices should not be used. [27]

"Strong" combination syrups are often ineffective in pediatric patients and can cause unwanted effects. Safer alternatives for children include non-drug methods, and for children over 1 year of age, limited use of honey before bedtime. [28]

Table 5. Methods and means that are best avoided

Approach	Why it's not worth it	Who is especially at risk?
Steam inhalation over boiling water	No proven benefit, high risk of burns	Children, pregnant women
Essential oils and concentrates without control	Toxicity, respiratory irritation	Children, people with asthma
Oil drops and ointments for the nose	Risk of lipoid pneumonia	Children
Combined "strong" syrups	Modest effectiveness, side effects	Children under 6 years old
Summary of clinical sources. [29]

Children and Pregnancy: Focus on Safety

For children under 6 years of age, most cough suppressants are not recommended. Basic measures include warm fluids, nasal rinsing with isotonic solutions, and honey only after 1 year. Honey dosages should be selected carefully, taking into account the sugar content, and it is contraindicated in infants. [30]

During pregnancy, methods with a well-established safety profile are a priority. Warm drinks and saline nasal solutions are acceptable, as are topical treatments approved by a physician if necessary. Herbal remedies and essential oils should not be used during this period without an individual risk assessment. [31]

If a child has a persistent cough for more than 4 weeks, wheezing, intercostal retractions, refusal to drink, or a high fever, an in-person pediatric evaluation is required. It is important to promptly rule out prolonged bacterial bronchitis and other causes. [32]

Parents should remember that the goal of interventions is to improve sleep and tolerance, not to eliminate the cough at any cost. A gradual reduction in symptoms in the absence of warning signs is a typical and safe trajectory. [33]

Table 6. Safe measures for children and during pregnancy

Situation	What is possible?	What to avoid
Children over 1 year old	Warm drinks, honey before bed, saline solutions	Codeine, combination syrups without a prescription
Children under 1 year old	Warm drinks, saline sprays	Honey, essential oils, steam over boiling water
Pregnancy	Warm drinks, saline solutions, agreed local remedies	Herbal remedies and essential oils without consultation
According to pediatric and general clinical sources. [34]

Chronic and refractory cough: what to do next

The treatment algorithm for chronic cough begins with eliminating the drug factor, specifically the angiotensin-converting enzyme inhibitor, which is replaced with an alternative if possible. Next, a chest X-ray and spirometry are performed, and signs of upper respiratory tract damage and reflux are clarified. [35]

In confirmed asthma, the mainstay of treatment is inhaled glucocorticosteroids; in postnasal drip syndrome, intranasal steroids and antihistamines; and in gastroesophageal reflux disease, lifestyle modifications and proton pump inhibitor therapy in carefully selected patients. Trial courses with response assessment are important. [36]

If cough persists despite targeted treatment, refractory chronic cough due to cough reflex hypersensitivity is considered. Behavioral techniques with a speech therapist and cough control training, sometimes combined with neuromodulators under specialist supervision, have proven effective. [37]

Newer options include P2X3 receptor antagonists. Gefapixant has received a positive opinion from the relevant European committee and regional approval, and randomized trials show a statistically significant, albeit modest, reduction in cough frequency with the most common adverse event, taste disturbance. The decision to use it is made by a specialist. [38]

Brief conclusion

For uncomplicated acute cough, treatment is often unnecessary; supportive measures and symptom control are sufficient. Antibiotics are not indicated, and cough suppressants are modestly effective. For coughs lasting longer than 8 weeks in adults or longer than 4 weeks in children, with "red flags" and severe discomfort, an in-person assessment and treatment of the underlying cause is necessary. For refractory chronic cough, behavioral techniques and new targeted approaches prescribed by a specialist are available. [39]