3. A peptic ulcer
If you are suffering from a peptic ulcer, you may experience the sight of blood in your stool. Peptic ulcers cause open wounds in either the lining of the stomach, the upper portion of the small intestine, or both. They occur when the highly acidic digestive juices in the gastrointestinal tract eat away at the protective layer that lines the stomach and small intestine. As the lining of the stomach or small intestine erodes and sores develop, bleeding can occur.
That blood empties the digestive tract through bowel movements, which can result in the visible appearance of blood in your stool. Other symptoms of a peptic ulcer can include a burning sensation in the stomach. If left untreated, peptic ulcers can cause severe internal bleeding that could end up necessitating blood transfusions. If you suspect you have a peptic ulcer, seek medical treatment immediately.