The cause of coffee-colored vomit is usually celiac bleeding gastritis, gastric ulcer, duodenal ulcer or cirrhosis of the liver, as follows: 1. Celiac bleeding gastritis, an acute gastritis characterized by celiac bleeding of the gastric mucosa, is one of the important causes of gastrointestinal bleeding. The blood itself is bright red, but it turns coffee-colored under the action of gastric acid. 2. peptic ulcer, which refers to ulcers that occur in the stomach and duodenum, including gastric ulcer and duodenal ulcer, the ulcer bleeds under severe stimulation, and there is usually also distention and pain in the upper abdomen, accompanied by nausea, burping, belching, vomiting, acid reflux and other symptoms. 3. cirrhosis of the liver, when suffering from cirrhosis of the liver patients often have Symptoms of portal hypertension, easily caused by varices in the esophagogastric fundus, will bleed when stimulated by food, and the blood will be coffee-colored when a small amount of exudation, and red when there is a large amount of blood.