Diabetes mellitus is a chronic, systemic, metabolic disease caused by a combination of genetic and environmental factors over a long period of time, characterized by increased plasma glucose levels, mainly due to disorders of sugar, fat and protein metabolism caused by insufficient secretion or impaired action of insulin in the body and affecting normal physiological activities. Typical symptoms of diabetes mellitus: “three more and one less” i.e. drinking more, urinating more, eating more and losing weight (weight loss). The majority of diabetic patients, especially those with type 2 diabetes, do not have any symptoms, or have only some unnoticeable discomfort, which, if left unattended, will only slowly develop as diabetes progresses. Atypical symptoms of diabetes: 1. repeated boils and carbuncles, skin injuries or wounds that do not heal after surgery; 2. itching of the skin, especially vulvar itching or urinary tract infections in women; 3. unexplained loss of vision and blurred vision in both eyes; 4. unexplained loss of sexual function and erectile dysfunction (impotence) in men; 5. premature onset of hypertension, coronary heart disease or stroke; 6. numbness and burning sensation in the lower limbs 7, protein in the urine (trace or obvious proteinuria).