The discharge of a little black feces half a month after stoma surgery may be a normal postoperative phenomenon, or it may be caused by diet and intestinal bleeding. 1. Postoperative normal phenomenon: it may be because the local residual blood is mixed together, causing the stoma to discharge a black liquid. 2. Diet: If you eat too much pig liver, duck blood, chicken blood, etc., or eat some special, indigestible food, such as black goji berries, it will cause the stoma to discharge black feces. 3. Intestinal bleeding: gastrointestinal bleeding will cause the stoma to discharge black, watery stools, as well as abdominal pain, bloating, nausea, vomiting and other symptoms. If the stoma surgery half a month out of a little black feces symptoms are not relieved, or accompanied by other symptoms, you should go to the hospital in time, clear reasons to give targeted treatment.