Black stool is very thin, may be due to physiological factors or pathological factors, can be targeted according to the cause of treatment. Common causes and treatments a. Physiological factors: eating certain black-colored food, coupled with a cold abdomen, may appear black and thin stools, such as pig’s blood, black sesame paste, black fungus, black beans, etc.. If this condition is caused by food, there is usually no dizziness, weakness, panic and other symptoms, no special treatment is needed, it is a normal physiological phenomenon. Second, pathological factors: 1, peptic ulcer: patients with more serious ulcers, ulcer surface larger and deeper, coupled with improper diet, alcohol, etc. will induce upper gastrointestinal bleeding, followed by black stool, while ulcer surface stimulated by gastric acid caused by indigestion, the performance of thinner stool, patients should be consulted as soon as possible to identify the cause of timely treatment; 2, portal hypertension: portal hypertension can lead to esophagogastric fundic varices. Patients with increased venous reflux will easily lead to rupture and bleeding of the esophagogastric fundic veins, thus affecting normal digestion and absorption, which can lead to black and thin stools, and patients should be diagnosed and treated symptomatically; 3, upper gastrointestinal tumor lesions: when patients have upper gastrointestinal tumors or polyps, the rupture of tumors and polyps can lead to bleeding and cause digestive system disorders, which can lead to thin black stools. Patients should go to the hospital in time to improve relevant examinations, such as H. pylori testing, abdominal ultrasound, etc., to clarify the cause of the disease, actively treat the original cause and follow medical advice to stop the bleeding. Note In addition, it should be noted that not all black stools are gastrointestinal bleeding, but also seen in nosebleeds, swallowed blood during tooth extraction or tonsillectomy, or ingestion of iron, bismuth, activated charcoal, etc., and should be distinguished. In daily life, patients should pay attention to dietary hygiene, eat lightly, and avoid spicy, cold and other stimulating foods. If physical abnormalities are found, they should go to the hospital in time for early detection, early diagnosis and early treatment.