Fecal occult blood (++) indicates the presence of gastrointestinal bleeding, of course, it may also be swallowed after hemoptysis resulting in a positive fecal occult blood, generally consider the possibility of gastrointestinal bleeding is more likely. Gastrointestinal bleeding is divided into upper gastrointestinal bleeding and lower gastrointestinal bleeding. Upper gastrointestinal bleeding is commonly caused by peptic ulcer, gastric cancer or esophageal varices rupture bleeding, these patients are usually accompanied by abdominal pain, bleeding and vomiting blood symptoms, through gastroscopy can be clearly diagnosed. Lower gastrointestinal bleeding is commonly caused by colon tumor, ischemic bowel disease, inflammatory bowel disease, etc., which can be clearly diagnosed through colonoscopy. In addition, it is recommended that the patient go to the hospital for routine blood tests to determine the degree of anemia through the amount of hemoglobin, which can roughly estimate the size of the bleeding.