Is black stool due to gastrointestinal bleeding serious?

Black, tarry stools due to gastrointestinal bleeding are generally quite serious. If the patient's condition is severe, it may be caused by gastric ulcers. Gastrointestinal bleeding can also result from tumors in the stomach. The patient should go to the hospital for a gastroscopy examination; if a tumor is found, surgical removal may be required. The patient should take anti-inflammatory medications as directed by a doctor to alleviate symptoms of gastric bleeding, and avoid consuming greasy or high-fat foods.