CAUSES OF ABDOMINAL PAIN: DD

Possible causes include:

Appendicitis (inflammation of the appendix)
Bowel obstruction
Cholecystitis (inflammation of the gallbladder) with or without gallstones
Chronic constipation
Dissecting abdominal aortic aneurysm
Diverticular disease, including diverticulitis
Easly-stage shingles (a viral infection where pain begins before the appearance of a rash)
Excessive gas
Food allergy
Food poisoning (salmonella, shigella)
Gastroesophageal reflux
Heartburn or indigestion
Hernia
Infectious mononucleosis
Inflammatory bowel disease (Crohn's disease or ulcerative colitis)
Intussusception -- while uncommon, this is a serious possible cause of pain in an infant who may be bringing the knees to the chest and crying
Irritable bowel syndrome
Kidney stones
Lactose intolerance
Pancreatitis (inflammation of the pancreas)
Parasitic infections (Giardia)
Sickle cell crisis
Spinal fracture
Ulcers
Urinary tract infections
Viral gastroenteritis (stomach flu)