The appendix is on the right side. It sits in the lower right area of your abdomen, where your small intestine connects to your large intestine. Specifically, it’s a small, finger-shaped pouch that hangs off the cecum, which is the very first section of your large intestine.
Exact Location in the Abdomen
If you divide your belly into four quadrants using your navel as the center point, the appendix falls in the lower right quadrant. It dangles from the cecum, which sits just above where your right leg meets your torso. The classic surface landmark doctors learn in medical school is called McBurney’s point, roughly one-third of the way along a line drawn from your right hip bone to your navel. Interestingly, a study of 51 barium enema exams found that 70% of appendices actually sit lower than this textbook landmark, closer to the pelvic region than traditional surgical teaching assumes.
This matters because when people try to locate appendix pain by pressing near their navel, they’re often aiming too high. The appendix tends to sit lower than most people expect.
How Appendicitis Pain Moves to the Right Side
Appendicitis pain doesn’t always start on the right. In the classic pattern, the pain begins as a dull ache around the belly button, then over 12 to 24 hours shifts to the lower right side and sharpens. This migration happens because the initial inflammation irritates nerves that your brain interprets as central abdominal pain. Once the inflammation spreads to the abdominal wall lining near the appendix itself, the pain localizes to the right.
That said, this textbook progression doesn’t happen every time. Research shows that the characteristic shift to the right lower quadrant has about 80% sensitivity for appendicitis, meaning roughly one in five people with appendicitis won’t follow this pattern. Some people feel pain in their pelvis, their flank, or even their back, depending on exactly where their appendix is positioned.
One diagnostic trick takes advantage of the appendix’s right-sided position. If a doctor presses deeply on your left lower abdomen and slides upward, the pressure pushes trapped air backward through the colon. That air distends the inflamed appendix on the right side, triggering pain there. This technique, called the Rovsing sign, essentially uses your left side to confirm a problem on the right.
When the Appendix Is on the Left Side
In rare cases, the appendix can be on the left. The two main reasons are situs inversus and intestinal malrotation.
Situs inversus is a condition where all your internal organs are mirror-flipped. Your heart sits on the right, your liver on the left, and your appendix ends up in the lower left quadrant. It affects about 1 in 10,000 people. Most people with situs inversus live completely normal lives and may not even know they have it until an imaging scan reveals the reversal. The danger comes if they develop appendicitis, because the pain shows up on the “wrong” side. A doctor who doesn’t know about the reversal might rule out appendicitis entirely.
Intestinal malrotation is a developmental condition where the intestines didn’t complete their normal rotation during fetal development. In one form (type 1, or nonrotation), the small bowel ends up on the right side and the large bowel, including the cecum and appendix, lands on the left. Malrotation occurs in about 1 in 6,000 births. People with this condition face the same risk of appendicitis as everyone else, but the left-sided location of their cecum can make diagnosis significantly harder.
Does Pregnancy Shift the Appendix?
A long-standing belief in medicine holds that the growing uterus pushes the appendix upward as pregnancy progresses, which could change where appendicitis pain is felt. A study of 77 pregnant patients put this to the test using imaging, and found the appendix stayed in its normal lower right position in about 82% of cases. Among the 18% where it did migrate upward, the average displacement was only about 2.8 centimeters, with a maximum shift of 4.5 centimeters.
Perhaps surprisingly, the appendix was more likely to shift in the late third trimester (around 37 to 38 weeks) than at full term. None of the patients studied at 41 to 42 weeks showed upward migration. So even during pregnancy, the appendix generally stays in the lower right abdomen, and pain from appendicitis will typically still be felt there.