The appendix is on the lower right side of your abdomen. It’s a small, tube-shaped organ that hangs off the beginning of your large intestine, at the spot where your small intestine connects to it. If you drew a line from your belly button to the bony point of your right hip, the appendix sits roughly one-third of the way up from the hip, typically 1.5 to 2 inches from the hip bone toward the navel. Surgeons call this landmark McBurney’s point.
Exactly Where It Sits
The appendix attaches to a pouch called the cecum, which is the very first section of your large intestine. Think of the cecum as a short dead-end street at the junction of the small and large intestines, and the appendix as a narrow alley branching off it. In standard anatomy, this junction falls in your right lower quadrant, the area below and to the right of your belly button.
That said, the appendix doesn’t always point in the same direction. A CT-based study of over 1,000 patients found that the appendix tucked behind the cecum (pointing upward toward the back) in about 29% of people, dangled down into the pelvis in 22%, and looped behind part of the small intestine in 33%. These variations are completely normal, but they explain why appendicitis pain sometimes shows up in slightly different spots or feels different from person to person.
Can the Appendix Be on the Left?
In extremely rare cases, yes. A condition called situs inversus totalis causes a mirror-image flip of all the organs in the chest and abdomen. The heart points to the right, the liver sits on the left, and the appendix ends up in the lower left quadrant. This occurs in roughly 1 in 10,000 to 25,000 births. Most people with the condition are diagnosed in childhood through routine imaging, so they already know about it. But occasionally someone discovers it only when they develop left-sided abdominal pain that turns out to be appendicitis.
How Appendicitis Pain Moves
Knowing which side the appendix is on matters most when you’re trying to figure out whether abdominal pain could be appendicitis. The classic pattern has a distinctive two-stage progression. Pain usually starts as a vague, dull ache near the belly button. It may come and go, and many people initially mistake it for a stomach bug or gas.
Over the next 12 to 24 hours, the pain migrates. As the inflamed appendix irritates the lining of the abdominal wall, the discomfort shifts to the lower right side and becomes sharper, more constant, and harder to ignore. Walking, coughing, or pressing on that area tends to make it worse. This migration pattern, belly button to lower right, is one of the most reliable early clues that the problem is the appendix rather than something else. Not everyone follows this textbook timeline, though. People whose appendix points toward the pelvis may feel the pain lower, closer to the bladder or groin, while a retrocecal appendix (tucked behind the cecum) can cause pain that radiates toward the back or flank.
Other Causes of Right Lower Quadrant Pain
Several conditions produce pain in the same neighborhood as the appendix. Kidney stones passing through the right ureter can cause intense lower-right pain, though they usually bring waves of cramping rather than steady, worsening soreness. Inflammatory bowel disease and diverticulitis also affect the right lower quadrant. In women, ovarian cysts, ovarian torsion (a twisted ovary), ectopic pregnancy, and pelvic inflammatory disease can all mimic appendicitis closely enough that imaging is often needed to tell them apart.
How Doctors Confirm the Location
When appendicitis is suspected, imaging helps confirm whether the appendix is inflamed and pinpoints its exact position. CT scans are the most accurate tool for most adults, with a sensitivity around 95% and specificity around 94%. Using IV contrast dye pushes sensitivity even higher, to about 96%.
Ultrasound is preferred as a first step for younger, leaner patients (generally under 30 with a lower BMI) and for women when a gynecologic cause needs to be ruled out. It’s less consistent than CT, detecting the appendix in 60% to 83% of cases, but it avoids radiation exposure. For pregnant patients, MRI is the go-to option, with sensitivity and specificity comparable to CT while keeping the fetus safe from radiation.
In practice, the physical exam still carries weight. A doctor pressing on McBurney’s point, that spot one-third of the way from the right hip bone to the navel, and finding sharp, localized tenderness is a strong signal. Combined with the characteristic pain migration, fever, and elevated white blood cell count, the clinical picture often points clearly to the appendix before imaging even begins.