Positive fecal occult blood is not always scary. There are many reasons for positive fecal occult blood, and common causes include bleeding peptic ulcers, acute enteritis, and gastrointestinal tumors. Whether it is scary or not depends on the cause of the disease. 1. Peptic ulcer: gastric and duodenal ulcer basal blood vessels are eroded and ruptured will lead to gastrointestinal bleeding and positive fecal occult blood. If the bleeding is small, medication such as omeprazole can be used to stop the bleeding. If the bleeding is large, gastroscopy may be needed to stop bleeding, this situation should be treated promptly, relatively serious. 2. Acute enteritis: acute enteritis diarrhea severe patients can damage the intestinal mucosa, resulting in a small amount of intestinal bleeding, fecal occult blood test is positive. The symptoms will be relieved or disappear after treating the disease, is not serious. It can be treated with antibiotics such as norfloxacin and ciprofloxacin, which are prohibited in allergy, children, pregnancy and lactation, and the adverse reactions include headache, insomnia, itchy skin and so on. 3. Tumors of digestive tract: Ischemic necrosis of cancerous tissues of digestive tract such as progressive gastric cancer, rectal cancer and colon cancer, which can erode blood vessels and cause gastrointestinal bleeding, should be treated with early resection of large portion of stomach. Early gastric major resection or radical surgery for colorectal cancer should be performed. It is more serious if the tumor is malignant. Therefore, positive fecal occult blood is not very scary, patients should go to the hospital in time, clear fecal occult blood cause to give targeted treatment.