Symptoms of diarrhea all the time can be diagnosed by the following tests: 1. serological examination, by taking blood samples from the patient’s body, and subsequently by counting the cell counts of leukocytes and eosinophils in their serum, it is possible to make a preliminary diagnosis of whether the subject has inflammatory lesions of the digestive system. 2. stool culture test, because after the patient’s digestive system tissues are infected by sensitive bacteria Some of the pathogenic bacteria will attach to metabolites in the body and be excreted from the body again through the human excretory system. Therefore, by using stool smear test, the type of pathogenic bacteria can be clearly diagnosed and analyzed. 3. Gastroscopic biopsy, which is suitable for patients with unidentified chronic diarrhea and positive fecal occult blood test, can be combined with invasive examination of the internal tissues of the gastrointestinal tract and biopsy to make a comprehensive diagnosis of the type of disease and pathological stage of the patient. Diagnosis.