Hello,
The various possibilities which present with such pain in the abdomen are
appendicitis, diverticulitis, Crohn’s disease, bowel obstruction, ovarian cysts, ectopic pregnancy and pelvic inflammatory disease,irritable bowel syndrome , kidney obstruction or pyelonephritis, psoas abscess and volvolus (twisting of the sigmoid part of the large bowel on itself).
Investigations like ultrasound abdomen, CT abdomen and colonoscopy are required to confirm a diagnosis.