How to Know When Your IBS Pain Isn't Appendicitis

Appendicitis symptoms require immediate medical attention

In some people, the pain from irritable bowel syndrome (IBS) can be very severe and even mimic those of appendicitis. Telling them apart is not as easy as some people think, and even doctors can have a tough time differentiating them based on symptoms alone.

Still, there are ways to ascertain if your abdominal pain is caused by IBS or a sign that you need immediate treatment of an inflamed appendix.

Mid adult woman holding stomach
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What Is Appendicitis?

Appendicitis is a serious health condition in which the appendix becomes inflamed and fills with pus. This may happen due to a blockage caused by fecal matter, a swollen lymph node, a foreign object, or in rare cases, a tumor.

When appendicitis occurs, the appendix needs to be removed immediately via an appendectomy to prevent it from bursting, as this can lead to life-threatening complications.

When an appendix ruptures, its contents can spill into your abdominal cavity, leaving you at risk for a severe and potentially lethal infection known as peritonitis. Although the ultimate treatment for a ruptured appendix is an appendectomy, your doctor may first start you on a course of antibiotics to reduce the risk of postoperative infection.

Symptoms of Acute Appendicitis

There are several ways to tell if you have acute appendicitis and need immediate medical attention. The first is that the onset of pain is often abrupt and centered around the belly button.

Among the other signs of acute appendicitis are:

  • Pain that worsens and moves to the lower right part of your abdomen
  • Pain that worsens with movement or coughing
  • Loss of appetite
  • Nausea
  • Vomiting
  • Low fever
  • Chills

IBS vs. Appendicitis

One of the main clues that appendicitis is involved is that the pain will migrate from the navel to the right lower quadrant of the abdomen. With IBS, the pain tends to centered in the middle of the abdomen nearer to the stomach.

Risk of Unnecessary Surgery

Because the complications of acute appendicitis are so serious, surgeons typically err on the side of caution and choose to remove the appendix of anyone whose symptoms indicate appendicitis.

This leads to a high rate of what is called a "negative appendectomy," which is the removal of a non-inflamed appendix. The rate of negative appendectomies is approximately 15%, even with the use of modern diagnostic technology.

Because the symptoms of appendicitis and IBS overlap, people with IBS appear to be at a higher risk for unnecessary surgeries in general, including negative appendectomies. Research suggests that this may be because people with IBS are more likely to seek treatment and tend to be more anxious than those without.

"Chronic Appendicitis"

One of the main differences between IBS and appendicitis is that the former is chronic and the latter is acute. While people with IBS can have acute outbreaks of symptoms, the disease tends to be something they live with on an ongoing basis.

However, there is a small group of scientists who argue that some people have chronic appendicitis, otherwise known as recurrent appendicitis, appendicopathy syndrome, or neurogenic appendicopathy.

Chronic appenditis is not widely recognized in the medical community and even those who endorse the theory acknowledge that it is rare. It is theorized that the condition is related to the partial or intermittent obstruction of the appendix.

If such a condition were to exist, it could very well masquerade as IBS given that both syndromes involve recurrent abdominal pain (often worsened by a large meal) as well as chronic diarrhea, constipation. or both.

The only differentiating factor may be that the recurring pain is in the lower right corner of the abdomen in people with chronic appendicitis.

Telling the Difference

Given that many IBS patients undergo unnecessary surgery, most experts strongly advise against an appendectomy for a person who has IBS—unless, of course, there are signs of acute appendicitis.

This typically involves a battery of tests to confirm that appendicitis is involved, including:

If IBS is suspected, colonoscopy or endoscopy are often recommended alongside tests to check for lactose intolerance and bacterial overgrowth.

A Word From Verywell

It is important to note that the symptoms and severity of appendicitis can vary dramatically from one person to the next. If you suspect your appendix is the cause of your symptoms, call your doctor immediately. Do not wait.

If your appendix were to rupture, the pain may ease up but only temporarily. In addition to worsening pain, your abdomen will be very sensitive to the touch and all of the aforementioned symptoms will re-emerge but invariably be worse.

Even if your pain turns out to be IBS (or some other condition), it is better to be safe than sorry insofar as appendicitis is concerned.

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