I am no medical expert just a guy who suffered from lower back pain, groin pain and heavy legs for years. I had a cyst in my upper back about an inch or two away from my sppine and ever since it's removal my pain and heavy legs seem to have gone. It is like a miracle. I am not fully sure if this was the cause of my pain but wanted to share just in case someone else is experiencing something similar.So far so good and this was never diagnosed, I just got tired of having a big bump on my back and decided to get it removed. My sciatica was brutal and my legs were something I dragged around--I am only hoping this was it.