Severe pain in this area could be an infected gallbladder, diverticulitis of the colon in that area, and, rarely, appendicitis. Severe pain in the right flank is usually due to either a kidney stone or kidney infection, but a gallbladder attack can begin with pain in this area. The left upper quadrant seems to have fewer problems. Pain in the right lower quadrant of the abdomen is a real challenge for physicians, especially surgeons and gynecologists, as many problems can exist there. The first diagnosis that comes to mind is that of appendicitis, yet it is not the most common cause of right lower quadrant pain.
Constipation probably leads the list.
Kidney stones, tumors, diverticulitis of the colon, and inguinal hernias can cause pain in this area. In women, endometriosis, ovarian cysts and tumors, twisted fibroids, ectopic pregnancies, and infections in the fallopian tubes add to the challenge of a diagnosis. However, all of the female problems can be felt here. Finally the left lower quadrant is the most frequent site for diverticulitis and its resulting pain. Again, ovarian cysts, ectopic pregnancies and infected fallopian tubes can cause pains in women in this area.