Diabetes is the penetration of red blood cells through the intact wall of the small capillaries and veins in the surrounding tissue, caused by violation of the permeability of the vascular wall. Diapedes of erythrocytes was observed in physiological conditions (for example, when menstruation) and in many pathological conditions, such as hemorrhage when intoxication salts arsenic, mercury and phosphorus, with uremia, jaundice, and some infectious diseases (influenza, plague, anthrax). Diapedes of red blood cells determines the clinical picture hemorrhagic diathesis (see).