Dark brown stools may be normal or may be caused by high levels of dampness and heat. There are more reasons for dark brown stools, so it is recommended to consult your doctor. When eating a lot of dark-colored food, such as animal offal, green leafy vegetables, etc.; or taking some medications, such as iron supplements, bismuth pectin, etc., can lead to dark brown stools. Black-brown stools may also be caused by heavy dampness-heat, which is often accompanied by symptoms such as heavy head and body (heaviness of the head and limbs), low food intake, abdominal distension, nausea, bitter taste in the mouth, small amount of urine with a yellow color and odor, and itchy skin with easy to itch, ulceration and running water. The appearance of dark brown stools, if accompanied by other discomforts, it is recommended to consult a doctor promptly.