Diarrhea for several months is considered to be related to chronic inflammation, intestinal neoplastic diseases, parasitic infections and other diseases. 1. Chronic inflammation: when there is chronic inflammation in the intestines, such as chronic enteritis and other diseases, the intestines are stimulated by inflammation for a long time, which can lead to long-term indigestion, long-term diarrhea and other symptoms. 2. Intestinal neoplastic diseases: neoplastic diseases of the intestines, no matter benign tumors or malignant tumors, may lead to intestinal absorption dysfunction of patients, causing chronic diarrhea, recurrent abdominal pain, emaciation and other symptoms. 3. Parasitic infection: if the patient has parasitic infection in the body, such as Giardia flagellate infection, due to parasitic parasites in the gastrointestinal tract, it will lead to gastrointestinal dysfunction and symptoms of chronic diarrhea. Patients with diarrhea for several months without relief, it is recommended to seek medical attention in time to clarify the cause of the disease for treatment, so as not to miss the condition.