Black-green feces may be caused by eating a lot of green vegetables, gastrointestinal bleeding disorders, etc. Changes in fecal characteristics due to pathological factors require medication, surgery and other treatments. 1. Eating colorful food: If you have recently eaten chlorophyll-rich food such as green fruits and vegetables, or eat blood products, etc., black-green feces may appear, and this change is physiological and no need to worry. 2. Gastrointestinal bleeding disorders: gastrointestinal bleeding disorders such as gastric ulcer bleeding, duodenal ulcer bleeding, etc., may also cause black-green feces, in which the green substance may be caused by food factors. Black-green feces may also be caused by other reasons, the appearance of the above fecal abnormalities, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for targeted treatment.