Skip to main content


Medically reviewed by Last updated on Jul 28, 2023.

What is appendicitis?

Harvard Health Publishing

Appendicitis is an inflammation of the appendix, a small, fingerlike tube that hangs from the lower right side of the large intestine. The purpose of the appendix is not known. It usually becomes inflamed because of an infection or an obstruction in the digestive tract. If untreated, an infected appendix can burst and spread the infection throughout the abdominal cavity and into the bloodstream.

Symptoms of appendicitis

Symptoms of appendicitis include:

  • Abdominal pain, usually starting just above the belly button and then moving to the right lower side of the abdomen
  • Nausea
  • Vomiting
  • Abdominal swelling
  • Pain when the right side of the abdomen is touched
  • Low-grade fever
  • Inability to pass gas
  • Change in normal bowel pattern

If you have symptoms of appendicitis, do not take enemas or laxatives to relieve constipation: These medicines increase the chance that the appendix will burst. Also, avoid taking pain-relief medicines before seeing your doctor, because these medications can mask appendicitis symptoms and make diagnosis difficult.

Diagnosing appendicitis

Your doctor will review your medical history, especially any digestive illnesses. Your doctor will ask about your current digestive symptoms, including details about your most recent bowel movements: the timing, frequency, character (watery or hard), and whether the stool was streaked with blood or mucus.

Your doctor will examine you and check for pain in your lower right abdomen. In children, the doctor will look to see whether the child holds his or her hands over the navel when asked where it hurts. In an infant, flexed hips (knees held toward the chest) and a tender abdomen can be important clues to the diagnosis.

After the physical examination, your doctor will order blood tests to check for signs of infection and a urinalysis to rule out a urinary tract problem. Your doctor may order an ultrasound or computed tomography (CT) scan to help confirm the diagnosis. In very young children, a chest X-ray may be needed to rule out pneumonia.

Expected duration of appendicitis

Most people will seek medical attention within 12 to 48 hours because of the abdominal pain. In some cases, a low level of inflammation exists for several weeks before a diagnosis is made.

Preventing appendicitis

There is no way to prevent appendicitis.

Treating appendicitis

The standard treatment is to remove the appendix. The surgery, called an appendectomy, should be done as soon as possible to reduce the risk of the appendix rupturing. If appendicitis is strongly suspected, a surgeon will often advise removing the appendix even if an ultrasound or CT scan cannot confirm the diagnosis. The surgeon's recommendation to operate reflects the danger of a ruptured appendix: It can be life threatening, while an appendectomy is a relatively low-risk operation.

Surgeons will frequently opt for laparoscopic surgery to remove the appendix because the average length of stay in the hospital is shorter and recovery is quicker compared to the standard surgical approach.

People usually are given antibiotics intravenously (into a vein) during surgery. The antibiotic is continued until the day after surgery. If the appendix ruptured, the person will need to take antibiotics for a longer period of time.

People with early appendicitis may be treated with what is known as an "antibiotic first" strategy. This means treating with antibiotics, often intravenously for 24 to 48 hours and then orally for another 5 – 9 days.

Patients treated with this strategy need close observation. If they are not rapidly improving, surgery is performed. Even if the symptoms resolve completely, your doctor may recommend having an appendectomy later on.

Treatment options

The following list of medications are in some way related to or used in the treatment of this condition.

When To Call a Professional

To avoid the risk of a ruptured appendix, contact your doctor immediately if you or a family member has symptoms of appendicitis. Appendicitis is an emergency, and it requires immediate attention.


People who need surgery often stay in the hospital two to three days (if the appendix did not rupture). People who have an appendectomy normally recover completely.

In cases of a ruptured appendix, the hospital stay is usually longer. Although it is rare, a person can die of appendicitis if a ruptured appendix spreads infection throughout the abdomen and into the blood.

Additional Info

National Institute of Diabetes and Digestive and Kidney Disorders


Learn more about Appendicitis

Treatment options

Care guides

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.