There is not much connection between coffee and black stools. Coffee is a drink made from coffee beans, which is rich in substances such as caffeine, tannins, oils and nitrogen compounds, but it is important to note that women who are pregnant and breastfeeding need to drink coffee in moderation. Drinking coffee does not cause changes in stool characteristics, including the color, softness, hardness, and smell of the stool. If black stools occur, it is very likely that upper gastrointestinal bleeding conditions have occurred, such as: inflammation of the digestive tract, peptic ulcer, liver disease, upper gastrointestinal tract tumors and other diseases may cause black stools. In addition, some drugs such as bismuth may also cause black stools. Therefore, once you have black stool, no matter whether it is accompanied by other uncomfortable symptoms or not, you should go to the hospital in time and follow the doctor’s advice for treatment. Avoid further aggravation of the disease and cause more harm to the body.