I have kind of a strange feeling in my back, specifically my lower back. It's not so much painful as it is a pressure with a slight ache when I bend back. I've had worries of testicular cancer for a long time (Despite my doctor saying that I'm fine on more than one occasion) and I read that lower back pain is a sign of a more advanced cancer to the lymph nodes back there (Which I cannot feel. Is that a good thing?). If it helps, I did do some yard work yesterday (Mowing the lawn and washing the dogs) but I'm not sure if that's the cause or if it would last a while after such activities. Please help me, I can't live with this worry.