If you get the same charlie horse on the back of your thigh could it be?

something more seriuos I get the same muscle cramp only on the back of my left thigh when I bend it to sit a certain way it hurts real bad then I have to get up real fast and straighten out my leg and it goes away its been doing this ever since I hit 300#s about 1 yr. ago Dr. said it was just muscle spasms but I just wanted to know if any one alse had this and if I should be more concerned? thank you for any help.

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