So that is where a nerve runs and could be sciatica pain. Basically, a pinched nerve or compressed nerve. It's painful, I've had it!! Stretching is really key (stretch lower back, hamstring, calves, heels). Ibuprofen can help with pain relief. Ice pack or heating pad, either will also help with relief. But really, stretching is the best remedy in such situations. You can see a doctor to be sure. good luck