Symptoms of appendicitis may include

pain in the abdomen, first around the belly button, then moving to the lower right area

loss of appetite

nausea
vomiting

constipation or diarrhea

inability to pass gas

low fever that begins after other symptoms

abdominal swelling

Not everyone with appendicitis has all the symptoms. The pain intensifies and worsens when moving, taking deep breaths, coughing, or sneezing. The area becomes very tender. People may have a sensation called “downward urge,” also known as “tenesmus,” which is the feeling that a bowel movement will relieve their discomfort. Laxatives and pain medications should not be taken in this situation. Anyone with these symptoms needs to see a qualified physician immediately.

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The cause of appendicitis relates to blockage of the inside of the appendix, known as the lumen. The blockage leads to increased pressure, impaired blood flow, and inflammation. If the blockage is not treated, gangrene and rupture (breaking or tearing) of the appendix can result. 

Most commonly, feces blocks the inside of the appendix. Also, bacterial or viral infections in the digestive tract can lead to swelling of lymph nodes, which squeeze the appendix and cause obstruction. This swelling of lymph nodes is known as lymphoid hyperplasia. Traumatic injury to the abdomen may lead to appendicitis in a small number of people. Genetics may be a factor in others. For example, appendicitis that runs in families may result from a genetic variant that predisposes a person to obstruction of the appendiceal lumen.

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The appendix is a small, tube-like structure attached to the first part of the large intestine, also called the colon. The appendix is located in the lower right portion of the abdomen. It has no known function. Removal of the appendix appears to cause no change in digestive function.

Appendicitis is an inflammation of the appendix. Once it starts, there is no effective medical therapy, so appendicitis is considered a medical emergency. When treated promptly, most patients recover without difficulty. If treatment is delayed, the appendix can burst, causing infection and even death. Appendicitis is the most common acute surgical emergency of the abdomen. Anyone can get appendicitis, but it occurs most often between the ages of 10 and 30.

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