Hypomelanosis is a pathology of the formation of skin pigmentation against the background of some disease.

Hypomagnesemia is a plasma magnesium concentration less than 1.4 mEq/L (< 0.7 mmol/L). Possible causes include inadequate magnesium intake and absorption, increased excretion due to hypercalcemia or medications such as furosemide. Symptoms of hypomagnesemia are related to concomitant hypokalemia and hypocalcemia and include lethargy, tremor, tetany, seizures, and arrhythmias.

In many people, this pathology is associated with changes in the myocardium after a heart attack. In this case, the passage of the contractile wave in the scarred area deteriorates, which leads to the appearance of hypokinesia.

Hypokalemia is a condition in which the concentration of potassium in the blood serum is below 3.5 mmol/l (there are also more stringent criteria for hypokalemia - potassium level below 3.2 mmol/l).

Hypogonadism, or testicular insufficiency, is a pathological condition, the clinical picture of which is caused by a decrease in the level of androgens in the body, characterized by underdevelopment of the genitals, secondary sexual characteristics and, as a rule, infertility.

Hypoglycemia is a clinical syndrome caused by a decrease in blood glucose levels and characterized by clinical signs of activation of the autonomic nervous system and neuroglycopenic symptoms.

Hypochondria is a fear of serious illness based on a misinterpretation of physical symptoms or normal bodily functioning. Hypochondria is not intentional; the exact cause is unknown.

Hypocalcemia is a total plasma calcium concentration of less than 8.8 mg/dL (<2.20 mmol/L) with normal plasma protein concentrations, or an ionized calcium concentration of less than 4.7 mg/dL (<1.17 mmol/L). Possible causes include hypoparathyroidism, vitamin D deficiency, and kidney disease.

Hypoaldosteronism is one of the least studied issues of clinical endocrinology. Information about this disease is absent in both manuals and textbooks of endocrinology, despite the fact that isolated hypoaldosteronism as an independent clinical syndrome was described more than 30 years ago.