What is the definition or description of: muscle spasm?

Muscle spasm: Muscle spasms are typically painful involuntary muscle contracures which can occur in any part of the body, such as the neck, back and legs. There are various causes of muscle spasms such as recent injury or trauma and dehydration. Typically, patients can modify activity, rest, stretch, utilize heat or ice for treatment of muscle spasms. Rarely, patients can also utilize muscle relaxant medication