Eating black sesame will not cause black stools, but it depends on the amount of black sesame consumed. If you use black sesame in large quantities, or if you consume black sesame for a long time, you are likely to have black stools. For occasional or small amounts of black sesame, black stools will not occur. For black stools caused by food, there is no special smell and the stool is normal in nature, so you can pay attention to the identification. The cause of black stool is likely to be caused by upper gastrointestinal bleeding. For black stool caused by upper gastrointestinal bleeding, there is a distinct fishy odor, and the number of stools is often increased and the stools are not formed. If the patient is unsure when black stools appear, he or she can visit the hospital and cooperate with the doctor to give a stool routine plus occult blood test to help clarify the diagnosis.