The vast majority of appendix removals happen because of appendicitis, an infection that can turn life-threatening within hours. About 1 in 15 people in the United States will develop appendicitis in their lifetime, and surgery to remove the appendix (appendectomy) remains the most reliable treatment. Occasionally, the appendix is removed for other reasons, like a tumor discovered during imaging or another abdominal surgery, but acute appendicitis accounts for the overwhelming majority of cases.
What Causes Appendicitis
The appendix is a small, finger-shaped pouch attached to the large intestine in the lower right abdomen. Appendicitis starts when something blocks the opening of the appendix. The most common culprits are hardened stool, swollen lymph tissue (often from a viral infection), or, less frequently, tumors or parasites. Once blocked, bacteria multiply inside the appendix, causing it to swell, fill with pus, and become intensely inflamed.
Adolescents and males are diagnosed with appendicitis more often than other groups, though it can happen at any age. There’s no reliable way to prevent it, and it tends to come on suddenly.
Why It Can’t Wait
An inflamed appendix can rupture within 36 hours of the first symptoms. When that happens, bacteria from inside the bowels spill into the abdominal cavity, causing a serious infection called peritonitis. That infection can then reach the bloodstream and trigger sepsis, a cascade of organ failure that can be fatal. Untreated appendicitis has a mortality rate above 50%, which is why it’s treated as a surgical emergency in most cases.
The classic warning signs start with a dull pain near the belly button that migrates to the lower right abdomen over several hours, becoming sharper and more intense. Pressing on a specific spot in the lower right abdomen, known as McBurney’s point, typically causes significant tenderness. Many people also experience nausea, vomiting, fever, and either constipation or diarrhea. A hallmark sign is rebound tenderness, where the pain gets worse when you release pressure on the area rather than when you press down.
How Appendicitis Is Diagnosed
Doctors confirm appendicitis through a combination of physical examination, blood work showing elevated white blood cells, and imaging. CT scans are the gold standard, with a sensitivity of about 99% and an overall accuracy of 98%. Ultrasound is used as a first step in children and pregnant women to avoid radiation exposure, but it produces far more inconclusive results. In one large study, ultrasound gave a clear answer only about 16% of the time, while CT was diagnostic in over 97% of cases.
Surgery: Laparoscopic vs. Open
Most appendectomies today are performed laparoscopically, through a few small incisions using a camera and thin instruments. A large Cochrane review comparing the two approaches found clear advantages to the laparoscopic method. In adults, wound infections were about 58% less likely with laparoscopic surgery, hospital stays were roughly a day shorter, and patients returned to normal activity about five days sooner than those who had open surgery.
In children, the benefits were similar: wound infections dropped by about 75% with the laparoscopic approach, and hospital stays were nearly a day shorter. One trade-off in adults is a slightly higher risk of developing an abscess inside the abdomen after laparoscopic surgery, though this remains uncommon overall.
Open surgery, which uses a single larger incision, is still necessary in some situations. If the appendix has already ruptured, if there’s a large abscess, or if the surgeon encounters complications during the laparoscopic procedure, switching to an open approach gives better visibility and access.
Can Antibiotics Replace Surgery?
For certain uncomplicated cases, antibiotics alone are a real option. A large meta-analysis of over 2,100 patients published in The Lancet found that antibiotic treatment was safe and allowed roughly two-thirds of adults to avoid surgery during the first year. Complication rates were actually slightly lower in the antibiotics group (5.4%) compared to the surgery group (8.3%) at one year, though the difference wasn’t statistically definitive.
There’s an important exception. In patients whose blockage involves a hardened deposit called an appendicolith (visible on imaging), antibiotics performed significantly worse. About half of these patients ended up needing surgery within a year anyway, and the risk of complications was higher with the antibiotic-first approach. For this reason, doctors typically recommend immediate surgery when an appendicolith is present.
Other Reasons for Removal
Not every appendectomy is about appendicitis. About 7 in every 1,000 appendix specimens removed during surgery turn out to contain a carcinoid tumor, the most common type of appendiceal cancer. These tumors are almost always discovered incidentally, because they rarely cause symptoms. Most are small and located at the tip of the appendix, where they don’t cause blockages. In these cases, removing the appendix is typically the only treatment needed.
Surgeons also sometimes remove a normal-looking appendix during other abdominal procedures. This is called an incidental appendectomy and is occasionally done during surgeries for other conditions in the same area, partly to eliminate any future risk of appendicitis.
What Recovery Looks Like
After a laparoscopic appendectomy, most people return to work and normal routines within one to two weeks. Open surgery takes longer. During the first two weeks, you’ll need to avoid lifting anything heavy, including children, large bags of groceries, or pet food. Strenuous exercise like jogging, cycling, and weight lifting is off-limits for about two weeks as well.
Bathing is restricted for the first two weeks to keep incision sites dry. Showers are fine once your surgeon clears you. Driving depends on your comfort level and whether you’re still taking pain medication. The key test: you need to be able to move your foot quickly from the gas to the brake without pain.
Life Without an Appendix
For decades, the appendix was considered a useless evolutionary leftover, but that view has changed. Research now shows the appendix plays a role in immune function and acts as a reservoir for beneficial gut bacteria. It helps restock the intestines with healthy microbes after infections or disturbances like food poisoning or antibiotic use. Studies in mice have found that removing the appendix delays the buildup of certain immune cells in the large intestine and alters the composition of gut bacteria and fungi.
That said, people live full, healthy lives without an appendix. The body adapts, and other parts of the immune system compensate. There’s no special diet or ongoing treatment required after recovery. The practical reality is that the risks of keeping an inflamed appendix far outweigh any long-term consequences of losing it.