The appendix is a mysterious part of the body. Located on the right side of the body near where the small and large intestine meet, this thin tube is about four inches long. Its purpose? We’re not sure! Some experts theorize that the appendix stores good bacteria that are capable of restoring the digestive system after diarrheal illnesses. Others say that the appendix has no purpose and is just a remnant from previous stages of evolution.

While we don’t know why the appendix exists, we do know that it sometimes causes pain, though, true to its mysterious nature, we don’t know why that happens. Appendicitis—when the appendix becomes inflamed, infected or ruptured—causes severe abdominal pain, nausea and vomiting. If you’re experiencing constant, severe pain in your lower right abdomen that becomes worse when pressed or during movement, it’s a good idea to pay a visit to your clinician.

The most basic test for appendicitis is a simple physical exam. Your clinician may also request an ultrasound or a CT scan to show whether or not the appendix is swollen or has ruptured. If tests show that you have appendicitis, you’ll have your appendix surgically removed via an appendectomy. Depending on the method—a traditional large cut or a minimally invasive laparoscopy—recovery time varies, but it is not an uncommon procedure and the majority of patients recover within a few days to weeks with little to no complications.

While we don’t know why we have an appendix, we do know that we can get by without one; removing the appendix does not cause any direct health problems.