Muscle spasm is an intense reaction on the part of large muscle groups to injury
. In spasm, muscle groups contract very strongly in order to brace the injured structures. While painful and inconveniencing, muscle spasms provide protection to the body during times of injury and injury healing.Source:
Moffat, Marilyn, P.T., PhD, F.A.P.T.A, and Vickery, Steve. The American Physical Therapy Association Book of Body Maintenance and Repair. Owl Books, Henry Holt and Company, 1999. pp. 16-17.