Appendicitis: Causes, Symptoms, and When to Seek Care

Appendicitis is swelling and soreness in the appendix ^1,3. This small pouch joins the first part of the large bowel ¹. It sits in the lower-right part of the belly ^1,7.

The condition often starts when the appendix becomes blocked ^1,5. Pressure rises, blood flow falls, and swelling gets worse ^1,7. Without fast care, the appendix may break open and spread infection ¹.

The appendix is a thin, tube-shaped pouch ^1,7. It extends from the large bowel in the lower-right belly ^1,7.

Its usual location helps explain the common pain pattern ⁶. Pain often settles in the right lower part of the belly ^3,5. However, the exact site can vary with age and appendix position.

People can live a normal life without this organ. Its removal does not tend to require lasting diet or exercise changes ^2,7.

The condition often begins with a blockage inside the appendix ^1,4. This blockage can cause inflammation in the appendix ^1,7. Pressure then builds inside the pouch ¹.

A blockage can lead to increased pressure and problems with blood flow to the appendix ^1,7. The tissue becomes sore and swollen. Bacteria in the bowel can also start an infection.

The swelling may make the blockage worse. Without enough blood, the wall of the appendix can weaken. Holes may then form in that wall.

The appendix can rupture after symptoms begin ^6,10. A ruptured appendix can leak bacteria and bowel contents into the belly.

A burst appendix may spread infection throughout the belly ^1,7. It can also lead to an abscess, which is a pocket of pus ^2,10.

A burst appendix can lead to these serious health problems:

Delays in care raise the risk of a hole in the appendix. They also increase the risk of an abscess and severe infection. Prompt surgery can lower the chance of rupture and other problems ².

Several things may block the opening inside the appendix ^3,5. Hardened stool is one possible cause ^3,5. Other solid material can also block the narrow inner space.

An infection may cause tissue in the appendix wall to swell ⁵. That swollen tissue is one possible cause of appendicitis ^4,5. The blockage then starts a cycle of pressure and more swelling ^1,7.

Appendicitis can have more than one cause ⁵. The cause may involve an infection or a blockage in the bowel ^7,9.

A tumor can sometimes block the appendix ^3,4. A foreign object may also cause a blockage in rare cases ³. An intestinal parasite is another rare possible cause ^3,4.

Viruses, bacteria, and parasites in the gut may play a role. A bowel disease that causes inflammation may also contribute ⁵.

Possible causes described in the medical sources include:

A blockage inside the appendix can cause appendicitis ^1,4. Material becomes trapped, pressure rises, and swelling follows ^1,7.

Doctors cannot always find the cause of a case ⁵. An unknown cause does not make the condition less serious. Medical care is still needed at once when appendicitis seems likely ⁵.

Anyone can develop this condition ^1,10. It occurs most often from ages 10 through 30 ^1,10. Children, older adults, and pregnant people can also develop it ^3,6.

Family history may raise the risk, especially in males. Males also have a slightly higher risk than females. Risk factors alone cannot show whether the appendix is inflamed.

Belly pain is the main symptom ^1,5. The pain often starts near the belly button ^3,5. It may also begin in the middle or upper belly ³.

At first, the pain may seem mild or hard to locate ^3,4. It often grows sharper and more severe with time ^3,5. This change can happen within several hours ⁵.

The pain may then shift toward the lower-right belly ^3,5. It often becomes focused over the appendix ³. Right lower abdominal pain can worsen as swelling grows.

The pain may start in the lower-right area instead. Not everyone with appendicitis has all the usual symptoms ^1,6.

Certain movements may make the pain worse ^3,5. Walking and other sudden motions can increase it ^3,10. Coughing can also make the pain worse ^5,7.

A deep breath may worsen the pain ^5,7. Pressure on the sore area can also cause more pain ^3,8. These signs can help guide an exam, but they do not prove the cause.

A home pressure check alone is not the detailed history and physical exam a clinician uses to assess appendicitis ⁶. A trained clinician should check pain that may come from the appendix ^5,6.

Other symptoms may appear with the pain ^1,5. However, not everyone develops all the usual signs ¹.

Symptoms linked with this condition may include:

A bowel movement may seem as if it would ease the pain ^5,6. However, that feeling does not rule out a serious cause.

These signs can look like other bowel or urine problems. The pain pattern and medical tests help doctors sort out the cause.

Children may not show the typical group of symptoms ^5,6. This difference can make the condition harder to detect ³.

Appendicitis can be hard to detect in young children ^3,5. In infants, a sore belly may provide an important clue ⁹. Some infants may keep their knees pulled toward their chest ⁹.

Parents should not wait for every classic sign ^1,5. If the symptoms suggest appendicitis, the child needs care at once ⁵.

Older adults may also have an unusual pattern ^3,6. Their signs may be less clear than expected ^3,6. Early exam findings can also be mild or hard to detect.

Lack of right-sided pain does not rule out the condition ⁶. A medical exam is needed when the overall pattern raises concern ^5,6.

Pregnant people may feel pain higher in the belly. The appendix can sit higher during pregnancy. This shift can change where the pain is felt.

Pregnant people are also less likely to show the classic pattern ⁶. A clinician may use MRI instead of CT in some cases. MRI uses magnets and radio waves to make images.

Do not wait until every symptom appears ^1,5. Some people never develop fever, vomiting, or the usual pain pattern ^1,5.

The following pain patterns need urgent action when appendicitis seems possible:

These symptoms do not confirm the cause. However, a doctor must rule out appendicitis and other serious problems ^5,7.

A ruptured appendix may cause pain throughout the belly. A swollen belly may be an advanced sign and can suggest rupture ⁶.

A rupture can spread bacteria through the whole belly. This spread can cause peritonitis, a dangerous belly infection ^2,7. The infection may also enter the blood and cause sepsis ^4,6.

The appendix may break open without fast treatment ⁹. Prompt surgery lowers the chance of this problem ².

A brief change in pain does not provide a safe home diagnosis. Symptoms can vary, and medical tests are not perfect ^3,6.

There is no home check that can confirm appendicitis ⁶. Exam signs alone also cannot prove it. A clinician must consider the full pattern and test results.

Do not depend on the pain site alone. Children, older adults, and pregnant people may have less typical symptoms ^3,6. Pregnancy can also move the pain higher in the belly.

A clinician will ask about your pain and recent bowel movements ^8,9. They may ask how the pain moved or changed. Questions may also cover appetite, vomiting, and bowel habits ⁹.

The clinician will gently press different parts of the belly. They may check for pain in the lower-right area ^3,8. They may also look for stiff or tightened belly muscles ^3,8.

Pain after pressure is released can suggest irritation in the belly lining. However, no single exam sign confirms appendicitis.

Blood tests can look for signs of infection. A high white blood cell count may point toward an infection.

A urine test can check for other causes of pain. These causes include kidney stones and urinary tract infections. Learn more in our guide to UTI symptoms and treatment.

Imaging can help confirm the diagnosis or find another cause. Doctors may choose a test based on age and other needs.

Common imaging tests include:

No test works perfectly in every case ³. Doctors combine the history, exam, blood work, and images.

An appendectomy is surgery to remove the appendix ². It remains the standard form of care ^2,9. Doctors may give antibiotics before surgery to fight infection ^2,8.

Surgeons use two main methods:

Keyhole surgery is also called laparoscopic surgery ². It often leads to a shorter recovery and fewer hospital infections ². However, it is not right for every case.

Open surgery may be needed after rupture or widespread infection. It lets the surgeon clean the inside of the belly.

Some mild cases may improve with antibiotics alone ². This choice is limited to selected cases after a medical exam ^2,7. Surgery still remains the standard treatment ^2,4.

Careful follow-up is important when surgery is not used. The illness is more likely to return if the appendix remains.

A doctor should guide this choice ^2,7. Antibiotics alone are not a home treatment for suspicious belly pain.

A burst appendix may need urgent surgery ^2,7. The surgeon can remove the appendix and clean the belly ^2,8. Antibiotics also help treat the infection ^2,7.

If an abscess forms, doctors may drain the pus ^2,8. A tube placed through the skin may drain the infected fluid. Antibiotics may be given before surgery for appendicitis ^3,8.

Some people need a drain after surgery for a burst appendix. Recovery often takes longer when rupture has occurred ^3,7.

Appendicitis often begins with a blockage inside the appendix ^1,5. Pressure and swelling can then harm blood flow ^1,7. Without care, the appendix may rupture and spread infection ^1,7.

Pain often starts near the belly button and moves lower right ⁵. It may worsen with walking, coughing, or deep breathing ^3,5. Yet children, older adults, and pregnant people may have different signs ^3,6,10.