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Pain especially on the right side, may be the sign of a more serious illness like appendicitis, pancreatitis, food poisoning, gallstones, ectopic pregnancy, diverticulitis, viral hepatitis, kidney stones, gallstones, gastritis, stomach ulcers, pelvic inflammatory disease
, gastroesophageal reflux disease
, irritable bowel syndrome
, Chron's disease, lactose intolerance, urinary tract infection
or hiatal hernia.
for diagonosis you may consult your nearest physicians