Crohn’s disease, diverticulitis, infection in kidney
, kidney stones
, constipation, ovary involvement in women, ectopic pregnancy in women, mesentry (a thin tissue that carries the blood, nerves and lymphatics for the intestine) involvement, and an abscess in rectus abdominis muscle or psoas muscle can all cause lower right abdomen pain. Hence these causes should be eliminated by a CT scan of the abdomen. Crohn’s disease is a difficult entity to diagnose.