The causes of diarrhea include acute diarrhea and chronic diarrhea. Acute diarrhea includes infections, drugs, poisons, poisoning, etc. Chronic diarrhea includes infectious and non-infectious, as follows: 1, acute diarrhea: its infectious factors are commonly found in bacteria and intestinal toxins, viruses, parasites, fungi and many other causes, drugs are commonly cholinergic drugs, digitalis drugs, etc., poisons are commonly pesticide poisoning, heavy metal poisoning, etc., and other causes, such as intestinal ischemia, pelvic inflammatory disease, uremia, hyperthyroidism, and pancreatic cholera syndrome, can lead to acute diarrhea. 2, chronic diarrhea: infectious factors commonly parasitic infections, fungal infections, chronic bacterial infections, the most common non-infectious factors, including irritable bowel syndrome, ischemic enteropathy, radiation enteritis, malabsorption syndrome, and intestinal tumors, diverticulitis, etc. There are also some idiopathic chronic diarrhea, neurological and endocrine tumors, food allergies, etc., which can cause come diarrhea. When diarrhea symptoms appear, it is important to go to the hospital for relevant microscopy and give comprehensive treatment under the guidance of the doctor.