spasm
cramp
muscle spasm

I guess he must have seen us and had a muscle spasm, or something.

Muscle spasms may begin in the feet, face, and hands.

A doctor might say it was just a muscle spasm.

He missed several games with muscle spasms in his lower back.

They are calling it muscle spasms, and some around the team believe the problem to be in his back.

He was diagnosed as having muscle spasms in his back.

Every time you take a step it just grabs, like a muscle spasm.

Once in awhile I still get a couple muscle spasms here and there, but not like before.

Children may be more sensitive to the side effects of this drug, especially muscle spasms.

You get muscle spasms trying to shut your eyes tight, because it won't work.