Appendicitis
Stomach pain caused by appendicitis [3] is considered serious. Appendicitis is an inflammation of the appendix. It can become life-threatening if it is left untreated and the appendix ruptures, spilling its contents.
The appendix is a finger or pouch-like vestigial organ in your intestine you can function perfectly without. Doctors remove it surgically when treating appendicitis.
The main symptom of appendicitis is a dull ache around the navel. You may also feel this pain in your upper abdomen. The pain becomes more specific when the infection advances and concentrates in the lower-right side of the abdomen. This is the location of the appendix.