What causes appendicitis?The causes of appendicitis are not well understood, but it is believed to occur as a result of one or more of these factors: an obstruction within the appendix, the development of an ulceration (an abnormal change in tissue accompanied by the death of cells) within the appendix, and the invasion of bacteria. Under these conditions, bacteria may multiply within the appendix.
The appendix may become swollen and filled with pus (a fluid formed in infected tissue, consisting of while blood cells and cellular debris), and may eventually rupture. Signs of rupture include the presence of symptoms for more than 24 hours, a fever, a high white blood cell count, and a fast heart rate. Very rarely, the inflammation and symptoms of appendicitis may disappear but recur again later.
In most cases, a blockage inside the appendix probably starts a process in which the appendix becomes inflamed and infected. If inflammation continues without treatment, the appendix can rupture. A ruptured appendix spills bacteria-laden intestinal contents into the abdominal cavity, causing peritonitis, which may result in a life-threatening infection. A rupture also may cause an abscess (a pus-filled pocket of infection) to form. In a woman, the ovaries and fallopian tubes may become infected, and the resulting blockage of the fallopian tubes may cause infertility. A ruptured appendix also may allow bacteria to infect the bloodstream - a life-threatening condition called sepsis.