Black stools are commonly caused by gastrointestinal bleeding combined with infection, or recent improper diet and other diseases can also cause related symptoms, need to clarify the cause of symptomatic treatment. Common causes and treatments: 1, the application of damaging drugs or improper diet: pig blood, duck blood and other blood products are not fully digested in the digestive tract after consumption, which may lead to positive fecal occult blood, aspirin, azithromycin and other drugs can cause acute gastric mucosal lesions leading to bleeding, resulting in positive fecal occult blood, generally stop eating similar foods and drugs after the symptoms can gradually ease; 2. Gastric ulcer, duodenal ulcer: Patients can appear regular pain in the upper abdomen, serious gastric bleeding can occur, the differential diagnosis can be made through gastroscopy, after the diagnosis can be used antacids such as omeprazole, ranitidine, etc. to reduce gastric acid secretion, with the application of iron to prevent anemia, serious bleeding need to be treated by gastroscopic intervention to stop bleeding; 3, cirrhosis: patients with acute hemorrhage can 3, cirrhosis: patients who have acute hemorrhage, vomiting blood, black stool, can be used for antiviral treatment such as entecavir, tenofovir, etc., acute bleeding requires drug therapy with endoscopic or interventional treatment; 4, hemorrhoids: can be manifested as bleeding, perianal itching, etc., can be warm water bath to relieve perianal discomfort, the occurrence of embedded hemorrhoids or necrosis should be surgically removed; 5, rectal polyps: generally no symptoms, a small number of patients can appear blood in the stool, polyps prolapse, the rapid and heavy performance. 6.Gastric cancer: Patients may have symptoms such as anemia, emaciation, palpable mass in the upper abdomen, blood in stool, etc. Gastroscopy should be performed in time to confirm the diagnosis, and then surgery should be performed in time to remove the cancerous lesions and improve the survival rate with radiotherapy and chemotherapy, if they cannot eat through the mouth, they can use parenteral nutrition such as glucose and vitamin infusion to supplement energy, and apply painkillers such as diazoxide to relieve pain. Such as diazoxide can relieve the pain and ensure the quality of survival. Precautions: If symptoms persist without relief, treatment should be actively pursued. During treatment, patients should pay attention to a balanced diet, avoid cold and irritating foods, strictly abstain from alcohol, control weight, pay attention to rest, and also exercise appropriately to enhance physical fitness.