Normal stool color is yellow, brownish-yellow, but it may vary depending on the patient’s diet. Under normal circumstances, patients have a balanced diet, good eating habits, not picky eaters, the general stool is yellow, brownish-yellow. If the patient consumes too much green vegetables, such as leeks, oil wheat, spinach, cucumber, etc., this time the stool is more green. If the patient consumes too much tomato, watermelon, dragon fruit and other red foods, the stool is mostly red dilute stool. When the patient consumes too much blood products, the stool is black. Stool color is greatly affected by diet, when the discovery of abnormal stool color, need to be combined with the nature of the stool, stool frequency and whether abdominal pain and other manifestations, under the guidance of a professional physician to make a comprehensive judgment.