Purple bowel movement is mostly considered to be caused by eating too much colorful food or medicine, indigestion, intestinal bleeding and other reasons. 1. Eating too much colorful food or drugs: If you eat too much tomato, watermelon, red dragon fruit, purple kale and other foods or drugs containing iron, resulting in part of the pigment can not be absorbed and digested, will be discharged with the stool, resulting in purple bowel movements. 2. Indigestion: If the gastric power is insufficient due to overeating, excessive intake of spicy and stimulating food, long-term alcohol consumption, etc., causing indigestion, so that the food in the body can not be completely decomposed and digested, so that part of the pigment will be mixed with the purple color, and discharged along with the intestines with the stool, which makes it easy to have a purple bowel movement. 3. Intestinal bleeding: due to trauma, ulcers, tumors and other reasons lead to intestinal bleeding, blood in the body for a long time to stay, with the bowel discharge, easy to appear in the case of purple bowel movements. There may be other reasons for the purple color of the bowel movement. If the above symptoms occur frequently, it is recommended to consult a doctor in time for examination and treatment.