I'm a 17 year old male (soon to turn 18) and about 3 weeks ago is when this discomfort on the right side of my body started. I remember on that day my mother had bought a rug to place under the kitchen table and it was the same day when this started happening to me. All I remember that may or may not have caused this problem is stretching my legs fairly high above the kitchen counter (not really with a warmup or anything) and moving the table itself with the assistance of my mother and that's about it. On the same day, I shifted around in my computer chair and then had a sharp pain in my right, lower side (at the top of the right side of my pelvis) that radiated down my leg and went away very quickly. I thought nothing of it at first and it didn't last very long. Later that night I started having mild discomfort on the right side of my body around the same place the radiating pain started in. The sudden discomfort wasn't that bad, but it was worrying me greatly. Putting a heating pad on it for a while did seem to calm the discomfort down but I haven't done that since the first day. Anyways, cutting to the chase, I've been to the local urgent care clinic recently and the doctors ran a blood pressure test (normal), a urine test (normal), tested for appendicitis (I do not have it) and the doctor believed that the discomfort is too high on me for it to be a hernia. Quite frankly, I have no idea WHAT this is or could be. I have yet to do an ultrasound that the doctor requested, but that is to be coming up very soon. Is it possible that I pulled a muscle? What I should note as well is that the amount of discomfort I experience depends on how I'm sitting or standing, even though it never exceeds a slight to mild discomfort. The discomfort has also seemed to shift around my right side over these past 3 weeks and has changed places from being at the right side of my pelvic region to my right oblique area to my right lower back and back to my right oblique, except a bit higher up. What could this be? The discomfort is slight to mild. Nothing unmanageable.