Usually, blood in the stool may be related to gastrointestinal bleeding, anal fissure, hemorrhoids, enteritis and other conditions. 1. Gastrointestinal bleeding: Inflammation, injury, tumor and other conditions in the digestive tract may lead to gastrointestinal bleeding. Usually, in addition to forming stools but with occult blood in the stool, patients may also have symptoms such as dizziness, panic attacks, cold sweat, fatigue, dry mouth and so on. 2. Anal fissure: anal fissure is usually caused by the poor elasticity of the anal canal skin, anal injury, constipation, etc. Usually, the patient will have symptoms such as shaped stool but occult blood and anal pain. 3. Hemorrhoids: Hemorrhoids may also occur in patients with formed stools but occult blood in the stool, usually the anus may also appear to be swollen. 4. Enteritis: Patients with enteritis may also experience blood in the stool, usually due to infection. There may also be other causes of blood in the stool, so we suggest that patients go to the hospital in time, complete the examination to determine the cause of the disease, and then under the guidance of the doctor to give targeted treatment or therapy.