Hi, my 11 year old son has lower left hand side abdominal cramps.  He has had them for some time, and we have seen a doctor who cannot find any reason for them.  He has just had like an explosion feeling tonight in his lower left hand side and says the cramps move up and down that side of his lower body.  I looked up and noted the appendice was on the right hand side, so not sure what it could be.
Hi ! Does your son get increased frequency of going for washroom associated with the cramps and a habit of eating junk foods form outside ? If yes, then possibly he's suffering from simple colitis which needs a stool test and culture sensitivity test if required. Your family physician may prescribe some anti-amebic Chat Doctor. Next diagnosis which has to be excluded is a urinary tract infection, which may give rise to similar kind of situation. Go for a routine urine test and a culture sensitivity of urine if need be. Show the results to your family physician for further action. You are right ! There is a very remote possibility of the pain being due to an appendicitis on the left side. I hope this helps you in solving your problem. Wish your son an early recovery.