After experiencing knee pain mainly in my right knee but also somewhat in my left for roughly three months (pain that I thought was just standard runner's knee), I started to experience tightness and pain in my lower back. This pain was very low, centralized in the area just above my buttocks. I also started to experience the sensation of pins and needles in both legs more frequently. I saw an orthopedist today who said he thought it was probably either a strained lower back (since my lower back seemed extremely tight) or sciatica. We were able to do X-rays, which showed only that I had a straight back, but did not indicate the presence of a tumor. To be on the safe side/to get a clearer picture of things, I have an MRI scheduled for next week.
In the meantime, I have been reading online about the potential causes of my symptoms, and I am extremely concerned that my symptoms do in fact seem to reflect those of spinal tumor back pain -- the tingling in my legs, and pain that does seem to be somewhat worse when lying down/going to sleep. I also tend to urinate frequently, though that has always been the case. The pain is certainly not severe or particularly debilitating -- I can preform essentially any activity, including running, without too much of an issue. Going for long walks seems to help. Stretching out the back based on yoga poses I found online seemed to help initially, but now I'm not so sure it's effective (though I haven't been keeping up with them).
I just wanted to see if anyone felt I had legitimate cause for concern, or whether a spinal tumor was out of the realm of possibility.
Many thanks!