Blood Vomiting

Stomach ulcer or severe gastritis. If you vomit blood and also have a burning or gnawing pain in your tummy, the most likely causes are a stomach ulcer or severe inflammation of the stomach lining (gastritis). Bleeding occurs when the ulcer or inflammation damages an underlying artery.

Schedule a doctor's visit. Make an appointment with your doctor if: Vomiting lasts more than two days for adults, 24 hours for children under age 2 or 12 hours for infants. You've had bouts of nausea and vomiting for longer than one month.