<unk>  may be caused by: * Peptic ulcer. This may be related to Zollinger–Ellison syndrome, which causes severe disease. * Vascular malfunctions of the gastrointestinal tract, such as bleeding gastric varices or intestinal varices. * Mallory-Weiss syndrome: bleeding tears in the esophagal mucosa, usually caused by prolonged and vigorous retching. * Vomiting of ingested blood after bleeding in the mouth, nose, or throat. * Tumors of the stomach or esophagus. * Irritation or erosion of the lining of the esophagus or stomach. * Radiation poisoning. * Viral hemorrhagic fevers. * Gastroenteritis. * Gastritis. * Chronic viral hepatitis. * Hepatic schistosomiasis, or intestinal schistosomiasis. This is caused by the parasite Schistosoma mansoni. * Iatrogenic injury (invasive procedure such as endoscopy or transesophageal echocardiography) * Atrio-oesophageal fistula. * Yellow fever. * Strongyloidiasis. * Certain drugs.
Hematemesis
Gallbladder flush
Hemoptysis
Subcutaneous emphysema
Peripolesis
Pneumoperitoneum
Hemoperitoneum
Hemarthrosis