Dark brown stools are abnormal and may be caused by food factors. After eating watermelon and dragon fruit, the color of the stool will change significantly; after eating animal blood, the same symptoms will occur. However, dark brown stools may also be caused by diseases, such as gastrointestinal bleeding and gastrointestinal disorders. Gastrointestinal bleeding stools can be particularly dark in color, along with symptoms of abdominal pain, while gastrointestinal dysfunction can result in loss of appetite and weight loss, sometimes with abdominal distention or pain. Gastrointestinal bleeding needs to be treated for the cause, and the stool will become normal in color after treatment, while gastrointestinal disorders need to take drugs to regulate the function of the stomach and intestines, and the effect can be seen in about three days of treatment, and the color of the stool will return to normal in about half a month.