Luminal GI tract

Peptic ulcer disease

Gastroesophageal reflux

Gastric neoplasms

Gastroparesis

Gastric infiltrative disorders

(amyloidosis, Menetrier's)

Malabsorption syndromes

Lactose intolerance

Parasites (Giardia lamblia)

AIDS

Chronica intestinal ischemia

Functional gastrointestinal disorders

Pancreatic disease

Chronic pancreatitis

Pancreatic neoplasm

Systemic conditions

Diabetes mellitus

Thyroid disease

Hyperparathyroidism

Chronic renal insufficiency

Pregnancy

Collagen vascular disorders

Ischemic heart disease

Intra-abdominal malignancy

Medications

Nonsteroidal anti-inflammatory drugs (NSAIDs)

Theophylline

Digitalis

Potassium

Iron

Niacin

Antibiotics

Alcohol

Miscellaneous causes of intermittent abdominal pain

Acute intermittent porphyria

Famillial Mediterranean fever

C1-esterase deficiency

Diabetic radiculopathy

Nerve entrapment syndromes

Vertebral nerve compression

Intussuscetion or internal hernia

Intermittent small bowel obstruction

Billiary tract disease

Cholelithiasis with billiary colic

Acute cholecystitis

Choledocholithiasis

Sphincter of Oddi dysfunction

Hepatobilliary neoplasms