Appendicitis nearly always happens when the inside of appendix gets blocked by something. This makes it swell up, and that makes the blockage worse. The bacteria that always live in intestines start an infection. In appendicitis, there is a serious Risk that appendix may burst. This can happen as soon as 48 to 72 hours after starting Symptoms. Because of this, appendicitis is a medical emergency.
Appendicitis may be caused by various infections, such as viruses, bacteria, or parasites. Or it may happen when the tube that joins appendix with large intestine gets blocked or trapped by stool. Sometimes tumors can cause appendicitis.
The appendix then becomes sore and swollen. The blood supply to the appendix stops as the swelling and soreness get worse. Without enough blood flow, the appendix starts to die. The appendix will burst as its walls start to get holes. These holes let stool, mucus, bacteria, and other things leak through and get inside abdomen and peritonitis occurs.