Causes of chronic constipation and common alarm symptoms Chronic constipation is a very common clinical condition. It is more common in the elderly population. Most of them are functional constipation, which is often referred to as “habitual constipation”, but we should be careful of organic diseases and medications, which should be given high priority to prevent delays. Chronic constipation has both functional and organic causes. Organic causes can be caused by gastrointestinal diseases, systemic diseases involving the digestive tract such as diabetes mellitus, scleroderma, neurological diseases, etc. Diseases and medications that can cause constipation include: 1, organic lesions of the intestinal canal such as tumors, inflammation or other causes of intestinal stenosis or obstruction; 2, rectal and anal lesions: internal rectal prolapse, hemorrhoids, anterior rectal bulge, puborectal hypertrophy, puborectal separation, pelvic floor disease, etc.; 3, endocrine or metabolic diseases: diabetic enteropathy, hypothyroidism, parathyroid disease, etc.; 4, neurological diseases 5. Neuromuscular lesions of the colon: pseudo-intestinal obstruction, congenital megacolon, megarectum, etc.; 7. Neuropsychological disorders; 8. antihistamines. Alarm symptoms: Blood in the stool, anemia, weight loss, fever, black stool, abdominal pain, etc. If any of the above symptoms occur, you should go to the hospital as soon as possible for relevant examination.