Diffuse bleeding from the gastric mucosa is regarded as a relatively unimportant phenomenon and is rarely, if ever, considered in the bedside diagnosis of patients afflicted with hematemesis. When the patient vomits blood, the differential diagnosis, as a rule, takes into consideration the following possibilities: The Most Common Causes of Gastric Hemorrhage Neoplasms: Carcinoma Polypi Ulcers: Acute Subacute and progressive Chronic Infections—Acute or Chronic (May cause either a local ulcer or a diffuse gastritis): Intra-abdominal (colitis, enteritis, gastritis) appendicitis disease of the biliary tract tuberculosis typhoid Extra-abdominal scarlet fever yellow fever measles cellulitis pneumonia diphtheria endocarditis Disease of the upper respiratory tract Pelvic disease Alcoholism Systemic Diseases: Cardiovascular heart failure endocarditis thromboses or emboli hypertension aneurysms ruptured varices esophagus rectum and anus (especially) Blood dyscrasias leukemia the purpuras Renal disease Cirrhosis Syphilis Allergy (urticaria) Corrosion: From ingestion of poisons, as chloride, iodine, lye, etc.