Always have diarrhea may be due to the existence of poor eating habits, irritable bowel syndrome, chronic enteritis, intestinal tumors and so on. 1. Poor eating habits: often drink ice water, eat cold drinks, eat spicy, eat greasy food can cause diarrhea. 2. Irritable Bowel Syndrome (IBS): it is a kind of functional bowel disease with recurring abdominal pain, abdominal discomfort, accompanied by changes in bowel habits as the main symptoms, and the onset of the disease is generally closely related to emotional factors such as tension, anxiety, and so on. 3. Chronic enteritis: it can be triggered by bacterial, viral and parasitic infections, and frequent diarrhea is a typical symptom, but the diagnosis needs to be perfected by colonoscopy, blood tests and other tests. 4. Intestinal tumor: if benign or malignant tumor occurs in the intestine, it may cause frequent diarrhea, and may also have bloody stools, abdominal pain and so on. There may be other reasons for frequent diarrhea, which can be clarified after going to the hospital for examination.