Diarrhea - the speeded up or unitary devastation of an intestine with allocation of liquid excrements (it is usual more than 200-300 gram for a day).

Etiology, pathogenesis. In a basis of a diarrhea the augmentation of active secretion by an intestine of sodium and water, rising of osmotic pressure in cavities of an intestine, disturbance of a peristalsis of an intestine, rising of an exudation of water and electrolytes in a lumen of an intestine can lay. The supersecretion in a small bowel develops at dissemination by its pathogenic microorganisms (for example, a choleraic vibrio, enteropathogenic viruses). The Supersecretion in a colon is possible at disturbance of an absorption in a thin intestine of fat acids with long chains, cholic acids (for example, at a dysbacteriosis). Disturbances of a peristalsis of an intestine are possible at an irritable colon, under influence of some purgatives (an extract of Senna, Bisacodylum, castor oil). Rising of an exudation of water and electrolytes accompanies an exudation of fiber in a lumen of an intestine through the damaged mucosa - at illness the Crone, a ulcerative colitis, a tuberculosis of an intestine, intestinal infections (a dysentery, a salmonellosis), at malignant tumours and ischemic diseases of an intestine.