Does coffee make your stool black?

Under normal circumstances, drinking coffee will not cause the stool color to turn black. If it is found that the stool color is black, it is closely related to the following two situations. First, diet or drugs. If you eat mulberry or iron-containing foods, such as animal blood, or colloidal bismuth, it will cause the stool color to turn brown or black. After stopping eating, you can return to normal stool color. This is a normal phenomenon and does not require treatment. Second, upper gastrointestinal bleeding, after stool occult blood test will prompt positive, once the black stool indicates that the daily upper gastrointestinal bleeding volume reaches 50~100 ml, need to timely go through gastroscopy to understand the specific causes of bleeding and timely hemostasis treatment.