Stomach bleeding is a more serious condition that is sometimes experienced when suffering from some stomach diseases. The causes of gastric bleeding may not be well understood, in fact, gastric bleeding is more common nowadays and patients often do not know what to do when they encounter it. So what are the causes of stomach bleeding? 1. Stomach cancer Those who suffer from stomach cancer may have stomach bleeding. I all know that cancer is a very terrible disease that can lead to various complications, so it is not surprising that it can cause stomach bleeding. When cancer develops to the later stage, the cancer cells will also spread to the surrounding tissues and cause more other problems, which must be treated actively. 2. Drinking a lot of alcohol Nowadays, many people have acute gastric bleeding caused by drinking a lot of alcohol, because alcohol is very stimulating to the stomach and intestines, and when alcohol causes gastric mucosa to be congested, people with thin gastric mucosa may cause gastric bleeding. Therefore, it is recommended that you should avoid drinking alcohol, and as a last resort, you should drink a small amount, not too much. 3, gastric ulcer patients often have gastric bleeding, because gastric ulcer will make the gastric mucosa inside the blood vessels are destroyed, the blood vessels have problems, bleeding is not surprising. The more serious the gastric ulcer, the greater the possibility of gastric bleeding. The bleeding must be treated promptly, or the bleeding may be life-threatening if it is severe.