Hypoglycemia is a decrease in plasma glucose concentration less than 2.8 mmol / l. Causes include non-compliance with insulin therapy in diabetes (skipping meals, exercise, alcohol consumption), various endocrine and metabolic disorders, and cancer. The clinical symptom complex is represented by vegetative and neuropsychiatric disorders of varying severity. Diagnosis is based on the detection of low fasting or postprandial plasma glucose. To stop hypoglycemia, oral fast-digesting carbohydrates, the introduction of glucose or glucagon are used.