Vomiting of blood is a symptom
called hematemesis. Either in liquid form or in clots, the blood is red or brown in color. This blood can come from the esophagus or the stomach, secreted by lesions
in the digestive system lining. Some of the most common causes for this condition include gastric or duodenal ulcer, esophageal varices
that often manifest in cases of liver
, or progressed gastritis. The blood can also come from the oral cavity, and can be regurgitated after having been swallowed, hence the need for an inspection of the mouth. An esophagogastroduodenoscopy can enable visualization of the oral cavity and the digestive lining by way of a camera inserted through the mouth in order to investigate the cause of bleeding.