I'm having a problem with my right hamstring, and not sure what to make of it. It is in a state of contraction almost all day. I can consciously relax it, but as soon as I stop thinking about it contracts again. I notice it while at work (desk job), while driving and while watching TV. It is not just tight or sore, but fully contracted. I'm not injured and haven't had such an issue before. I'm thinking possibly a nerve issue? Anyone experienced something similar?