There are many causes of constipation, but they are no more than intestinal lesions, extraintestinal lesions and changes in lifestyle habits. 1, intestinal lesion causes: mainly refers to the colon, rectum and anus of organic and functional lesions. (1) organic and functional lesions of the colon: including colon tumors, colon torsion, colonic diverticulitis, amebiasis, intestinal tuberculosis, syphilis, venereal lymphogranuloma, ulcerative Changzhou Hospital of Traditional Chinese Medicine Ma Chunlei colitis clonorchiasis, ischemic colitis, anastomotic stenosis, endometriosis, intussusception, intestinal adhesions and incomplete intestinal obstruction, colonic redundancy, congenital megacolon, colonic weakness, etc. (2) Recto-anal outlet obstruction: including recto-anal stenosis, anal fissure, hemorrhoids, rectal prolapse, rectal overlap, pelvic floor spasm syndrome, rectal prolapse, giant rectum, endometrial displacement, etc. 2. Extra-intestinal etiology: (1) Psychiatric and neurological lesions: including psychosis, depression, anorexia nervosa, central nervous system lesions, sacral nerve or cremasteric injury, etc. (2) Physical factors: Old age, frailty, prolonged illness, maternity, and laziness can cause constipation due to slowed gastrointestinal motility. (3) Endocrine abnormalities and metabolic diseases: such as hypothyroidism, hypercalcemia, pregnancy, diabetes mellitus, dehydration, hypokalemia, uremia, porphyria, decreased pituitary function, etc. (4) Water-electrolyte balance imbalance: such as massive sweating, diarrhea, vomiting, blood loss, or primary or secondary dehydration after fever, compensating to make the stool dry. (5) drug constipation: certain drugs such as calcium carbonate, aluminum hydroxide, opium, etc., and even prolonged laxatives can also lead to constipation. (6) colonic hypoacute: this situation is seen in the long-term use of laxatives, work overstressed face neglect stool, hyperparathyroidism. 3, unreasonable dietary habits, lifestyle habits and bowel habits.