ACS/MI
Boerhaave's
DKA
Intracranial Hemorrhage
Ischemic bowel
Meningitis
Sepsis
Acute radiation syndrome
Acute gastric dilation
Acetaminophen toxicity
Adrenal insufficiency
Appendicitis
Aspirin toxicity
Bowel obstruction/ileus
Carbon monoxide poisoning
Cholecystitis
CNS tumor
Digoxin toxicity
Electrolyte abnormalities
Elevated ICP
Gastric outlet obstruction, gastric volvulus
Hyperemesis gravidarum
Pancreatitis
Peritonitis
Ruptured viscus
Testicular torsion/ovarian torsion
Theophylline toxicity
Acute gastroenteritis
Biliary colic
Cannabinoid hyperemesis syndrome
Chemotherapy
Disulfiram effect
Erythromycin
ETOH
Gastritis
Gastroenteritis<unk> 
Hepatitis
Ibuprofen
Ipecac toxicity
Labyrinthitis
Migraine
Motion sickness
Narcotic withdrawal
Thyroid
Pregnancy
Peptic ulcer disease
Renal colic
UTI
GI
Peptic ulcer disease
Mechanical Obstruction
Adhesion
Small bowel obstruction/LBO
Gastric outlet obstruction/Pyloric stenosis
Volvulus
Strangulated hernia
Pancreatitis
Appendicitis
Cholecystitis, Cholangitis
Acute Hepatitis
IBD
Intussusception
Malignancy
Mesenteric ischemia
Esophageal disorders (e.g. achalasia, GERD, esophagitis)
Functional disorders such as Irritable Bowel Syndrome
Neurologic
Cannabinoid hyperemesis syndrome
Infectious
Spontaneous bacterial peritonitis
Urinary tract infection
Bacterial toxins, viruses (adenovirus, norovirus, rotavirus)
Drugs/Toxins
Heavy metal toxicity
Methanol toxicity
Endocrine
Diabetic ketoacidosis
Thyroid disorder
Parathyroid disorders
Uremia
Miscellaneous
Anorexia nervosa, Bulimia nervosa
Peptic ulcer disease
Mechanical Obstruction
Adhesion
Small bowel obstruction/LBO
Gastric outlet obstruction/Pyloric stenosis
Volvulus
Strangulated hernia
Pancreatitis
Appendicitis
Cholecystitis, Cholangitis
Acute Hepatitis
IBD
Intussusception
Malignancy
Mesenteric ischemia
Esophageal disorders (e.g. achalasia, GERD, esophagitis)
Functional disorders such as Irritable Bowel Syndrome
Adhesion
Small bowel obstruction/LBO
Gastric outlet obstruction/Pyloric stenosis
Volvulus
Strangulated hernia
Cannabinoid hyperemesis syndrome
Spontaneous bacterial peritonitis
Urinary tract infection
Bacterial toxins, viruses (adenovirus, norovirus, rotavirus)
Heavy metal toxicity
Methanol toxicity
Diabetic ketoacidosis
Thyroid disorder
Parathyroid disorders
Uremia
Anorexia nervosa, Bulimia nervosa
Gastroparesis
ACS/MI
Dysphagia
Boerhaave's
Dysuria
DKA
Constipation 
Intracranial Hemorrhage