Gurgling black stools may be caused by dietary factors or gastrointestinal bleeding. 1. Dietary factors: If you eat more green leafy vegetables or pig’s blood and liver, leading to indigestion, undigested green leafy vegetables or unabsorbed iron will be discharged along with the stool, which can be manifested as a gurgling stomach and blackish-green stools. 2. Gastrointestinal bleeding: gastric ulcers, duodenal ulcers, biliary bleeding and other diseases, resulting in iron in the blood in the intestinal tract for too long, oxidized to iron sulfide, which will form black stools. Gurgling stomach black stools may also be related to taking iron supplements such as ferrous sulfate, or taking bismuth pectin capsules. It is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy.