Severe intermittent leg pain I cannot explain.?

Yes, you should go to the Dr. Preventive health is the best way to avoid any major health probblems. I don't know your age but it could be anything from a strain from running to DVT which is very dangerous. There's just so many diagnoses, so to be safe...see a Dr. It wont hurt to drop in for a visit and get it examined and xrayed if needed. Take care and wish you luck. Hopefully it's nothing major.