Signs and symptoms of appendicitis may include:

• Sudden pain that begins on the right side of the lower abdomen
• Sudden pain that begins around your navel and often shifts to your lower right abdomen
• Pain that worsens if you cough, walk or make other jarring movements
• Nausea and vomiting
• Loss of appetite
• Low-grade fever that may worsen as the illness progresses
• Constipation or diarrhea
• Abdominal bloating
• Flatulence

The site of your pain may vary, depending on your age and the position of your appendix. When you're pregnant, the pain may seem to come from your upper abdomen because your appendix is higher during pregnancy.

A blockage in the lining of the appendix that results in infection is the likely cause of appendicitis. The bacteria multiply rapidly, causing the appendix to become inflamed, swollen and filled with pus. If not treated promptly, the appendix can rupture.

Appendicitis can cause serious complications, such as:

• A ruptured appendix. A rupture spreads infection throughout your abdomen (peritonitis). Possibly life-threatening, this condition requires immediate surgery to remove the appendix and clean your abdominal cavity.
• A pocket of pus that forms in the abdomen. If your appendix bursts, you may develop a pocket of infection (abscess). In most cases, a surgeon drains the abscess by placing a tube through your abdominal wall into the abscess. The tube is left in place for about two weeks, and you're given antibiotics to clear the infection.

Once the infection is clear, you'll have surgery to remove the appendix. In some cases, the abscess is drained, and the appendix is removed immediately.