Simple indigestion does not usually result in black stools. Indigestion is generally categorized into functional indigestion and organic indigestion. Functional dyspepsia, such as gastrointestinal dyskinesia or dyspepsia caused by mental factors, usually does not lead to black stools. However, if the patient has organic lesions, such as gastric ulcer, duodenal ulcer, rupture and bleeding of fundic esophageal varices due to cirrhosis, or gastric cancer and other complications of indigestion, it may lead to black stools, but the black stools are mainly caused by bleeding due to organic lesions, not indigestion. If the patient has indigestion and recurrent black stools for a long time, he should pay attention to it, go to the hospital in time, and under the guidance of the doctor, carry out fecal occult blood test or gastroscopy, etc., and actively treat it.