A, water and electrolyte imbalance and acid-base balance disorder, diarrhea when the body loses a lot of water and electrolyte, leading to dehydration, hyponatremia, hypokalemia, acidosis. When potassium is deficient, arrhythmia, fatigue and even intestinal paralysis may occur. Severe hyponatremia can cause mental changes, so rehydration of acute diarrhea is very important.

Second, malnutrition diarrhea, especially chronic diarrhea, can be accompanied by the loss of nutrients, and the intake of nutrients can not be fully absorbed, which can cause malnutrition.

Third, lack of vitamins and minerals, long-term diarrhea can affect the body's absorption of vitamins and cause vitamin deficiency, such as iron and folic acid, B 12 deficiency can cause anemia, vitamin K deficiency can cause bleeding tendency, and vitamin D deficiency can cause calcium deficiency.

Fourth, the immune function declines, and long-term diarrhea can weaken the body's resistance to infectious diseases and infections.