Appendicitis is infection of the appendix. Serious complications of a ruptured appendix consist of widespread, painful irritation of the internal lining of the belly wall and sepsis. Appendicitis is due to a blockage of the hollow part of the appendix. This is most normally because of a calcified "stone" made from feces. Inflamed lymphoid tissue from a viral infection, parasites, gallstone, or tumors may also also reason the blockage. Symptoms normally encompass right lower stomach pain, nausea, vomiting, and decreased appetite. However, about 40% of people do not have these typical symptoms.