Gastroesophageal reflux disease (GERD)<unk>  with or without perforation
Gastritis
Pancreatitis
Gallbladder disease
Acute cholecystitis
Cholangitis
Symptomatic cholelithiasis
Acalculous cholecystitis
Myocardial Ischemia
Splenic Infarctionenlargement/rupture/aneurysm
Pericarditis/Myocarditis
Aortic dissection
Hepatitis
Pyelonephritis
Pneumonia
Pyogenic liver abscess
Fitz-Hugh-Curtis Syndrome
Hepatomegaly due to CHF
Bowel obstruction
SMA syndrome
Pulmonary embolism
Bezoar
Ingested foreign body
Acute cholecystitis
Cholangitis
Symptomatic cholelithiasis
Acalculous cholecystitis<unk>  (most common cause)
Gastritis/esophagitis
Gastric/esophageal varices
Mallory-Weiss tear
Malignancy
Aortoenteric fisulta
Boerhaave
Dieulafoy's lesion
Angiodysplasia
Hemobilia
Hemorrhagic gastritis, EtOH
Celiac disease
Dengue
Other intrabdominal bleeds
Hemorrhagic pancreatitis
Splenic rupture
Subcapsular cavernous hemangiomas
Peliosis hepatis
Hemorrhagic pancreatitis
Splenic rupture
Subcapsular cavernous hemangiomas
Peliosis hepatis
Hemoptysis
Vaginal/Urethra bleeding
ENT bleeding
Dietary (Iron, bismuth, beets)
Swallowed maternal blood (in neonate)
Peptic ulcer disease
Gastroesophageal reflux disease 
Gastritis
Peptic ulcer disease with or without perforation
Gastroesophageal reflux disease
Lower gastrointestinal bleeding
Pancreatitis
Gallbladder disease 