Stool occult blood (+) represents a small amount of red blood cells found in the stool during stool examination, which may be caused by diet, disease, and physicochemical injury. It is recommended to consult a doctor promptly to clarify the cause and give reasonable treatment to improve the situation of stool occult blood. Diet: mainly due to the patient’s intake of a certain amount of animal liver before the examination, such as pig liver, sheep liver, beef liver, or eat pig blood, duck blood and other foods, resulting in fecal residue containing a certain amount of animal red blood cells, resulting in fecal occult blood (+), is a normal phenomenon, do not worry too much, avoid these foods before the next examination can be. Second, disease factors: 1, gastrointestinal lesions: peptic ulcer, gastrointestinal tract perforation, hemorrhoids, gastrointestinal tumors and other gastrointestinal lesions, can cause gastrointestinal bleeding, when stool examination can present stool occult blood (+), which is more common is peptic ulcer and hemorrhoids. If the patient has a peptic ulcer, treatment with omeprazole combined with gastrointestinal mucosal protective agents is usually required to relieve the bleeding symptoms, and the commonly used mucosal protective agents include chewable magnesium aluminum carbonate and aluminum thioglycollate. If it is caused by hemorrhoids, external hemorrhoids can be treated by trying to apply Mainglong hemorrhoid suppositories and hydrocortisone ointment. In case of bleeding internal hemorrhoids, consider injecting sclerotherapy to make the internal hemorrhoids atrophy naturally. 2. Other common diseases: In addition to gastrointestinal lesions, portal phlebitis, liver cancer, gallbladder stones, pancreatitis, etc., and blood system diseases such as leukemia, thrombocytopenic purpura, hemophilia, etc., can also lead to internal bleeding and occult blood in the stool (+) in patients. Since there are more disease factors triggering fecal occult blood and the treatment varies, patients are advised to follow the doctor’s advice, conduct systematic examination and find the cause for active treatment. Third, physical and chemical injuries: 1. Physical injuries: including cases of laparotomy, trauma, radiotherapy, etc. After laparotomy, there will be a certain amount of exudation from the incision of the surgery, and the exudate will enter the intestine and be excreted with the stool will result in occult blood in the stool (+); in addition, trauma such as stabbing the internal organs with a sharp instrument or hitting the abdomen with a blunt instrument will also cause patients to have blood in the stool; there are also some patients who need long-term radiation treatment due to gastrointestinal cancer, and gastrointestinal bleeding is a common complication. In these cases, it is recommended to use hemostatic drugs to stop bleeding as prescribed by the doctor. 2. Chemical injury: Some patients taking drugs such as aspirin and diclofenac sodium can stimulate the mucous membrane of the gastrointestinal tract and cause gastrointestinal bleeding, at which time it is recommended to stop using the drugs and consult the attending physician if other drugs can be replaced. Food poisoning or chemical poisoning may also lead to acute gastrointestinal bleeding, which is critical and accompanied by nausea and vomiting, so patients need to be taken to the emergency department immediately to protect their lives through gastric lavage and enema.