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Appendicitis

Appendicitis is swelling (inflammation) of the appendix. The appendix is a small pouch attached to the beginning of your large intestine. Causes, incidence, and risk factors.

Appendicitis is one of the most common causes of emergency abdominal surgery in the United States. It usually occurs when the appendix becomes blocked by feces, a foreign object, or rarely, a tumor.

Symptoms

The symptoms of appendicitis can vary. It can be hard to diagnose appendicitis in young children, the elderly, and women of childbearing age.

The first symptom is often pain around your belly button. (See: Abdominal pain) The pain may be minor at first, but it becomes more sharp and severe. Your appetite will be reduced, and you may have nausea, vomiting, and a low fever.

As the swelling in the appendix increases, the pain tends to move into your right lower abdomen. It focuses right above the appendix at a place called McBurney’s point. This most often occurs 12 to 24 hours after the illness starts.

If your appendix breaks open (ruptures), you may have less pain for a short time and you may feel better. However, once the lining of your abdominal cavity becomes swollen and infected (a condition called peritonitis), the pain gets worse and you become sicker.

Your pain may be worse when you walk or cough. You may prefer to lie still because sudden movement causes pain.

Later symptoms include

  • Chills
  • Constipation
  • Diarrhea
  • Fever
  • Nausea
  • Shaking
  • Vomiting

Signs and tests

If you have appendicitis, your pain will increase when the doctor gently presses on your lower right belly area. If you have peritonitis, touching the belly area may cause a spasm of the muscles.

A rectal exam may find tenderness on the right side of your rectum.

Doctors can usually diagnose appendicitis by

  • Your description of the symptoms
  • The physical exam
  • Lab tests

In some cases, other tests may be needed, including

  • Abdominal CT scan
  • Abdominal ultrasound

Treatment

If you do not have complications, a surgeon will usually remove your appendix soon after your doctor thinks you might have the condition. For information on this type of surgery, see: Appendectomy.

Because the tests used to diagnose appendicitis are not perfect, sometimes the operation will show that your appendix is normal. In that case, the surgeon will remove your appendix and explore the rest of your abdomen for other causes of your pain.

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