I'm a college student, 5'7", 155 lbs, in pretty good shape. I'm in a martial arts club, so I can run and do kicks and rolls with no pain or mobility problems. Last summer (2013) I was sitting at a computer for long hours each day, and since then I've developed some kind of problem where I can't sit down normally without feeling pain/discomfort. It wasn't bad at first, but over months now it seems like any kind of pressure on the tailbone area (the bony region right where my back and butt meet) will aggravate it - even lying down flat on my back with legs straight out. After sitting normally for a minute or so, I feel the need to stand up, stretch, and put something back into place. It isn't a "painful" or sharp sensation that I get from doing any particular movement, but more of a discomfort that gradually gets worse the longer I sit. I can pop /something/ in the bony area right at the top of my butt, which provides some relief, but I don't know if I should be doing this. I don't have any kind of throbbing pain, or anything radiating down either leg.
I've found ways around it for sitting in class. Putting my weight on my elbows on the chair/desk takes some of the pressure off the area. Sitting cross legged or with one leg externally rotated makes it not as bad. I also got a wedge cushion with the tailbone section cutout that helps somewhat, but not completely. I got a standing xray done, but they mostly focused on the lumbar region, and they said it doesn't look like there are any problems, but I do have a 'lumbosacral transitional vertebra'. Doctor says it could be a disc issue, but to me it really feels like the problem is in the tailbone region, but I could be wrong.
Any idea what the problem is? This summer I've got another job at a computer, and I'm studying abroad in the fall, so I'd really like to take care of this soon - I'm too young for this!
Thanks in advance for any info.