They used to call them charlie horses. Could just be nerve spasms. In pregnant women, it is often caused by a lack of calcium
A Grinding Leg Pain That Comes And Goes. It Happens Suddenly And Goes Away Just As Quickly. What Could Cause Be?
Is they pain in your joints? Or muscle? If it is in joint it could be that you have arthritis or that your patella(knee cap) does not fallow the correct track. Muscel could be as the person said before me.