I just found out today that I may have arthritis. I used to jog a lot, and my knee hurt after I ran. At first I thought it was my running shoes, but it wasn't. I bought a new pair of awesome Brooks just to make sure, and it didn't take care of the problem. Getting new shoes used to help with shin splints, but my new running shoes, which fit perfectly, didn't do anything. Anyway, I stopped running last June (like 9 months ago), and started swimming. Actually, I'm teaching myself. However, my knee still hurts sometimes, and I don't know why. It will definitely hurt if I walk uphill or up a bunch of stairs, but it will occasionally start hurting when I've done nothing but post on MR all day. I thought I'd need an X-ray or MRI or something, but the doctor simply suggested that I may suffer from a bit of arthritis. He told me not to run anymore, and don't get back into it. I told him my knee even tingles after I swim. He said swimming and biking should be OK. Why do I get that weird sensation in my right knee, then? Does this sound like arthritis, or should I get a scan? He gave me a "prescription" for a scan if I want to get one, and another for a physiotherapist. He also told me to take glucosammine sulfate or something, which is some sort of supplement. I have to take it every day. Anyway, it sucks. I loved running, but I also want to walk and play with my grandchildren when I'm 65, so I guess I should be careful.