Muscles will contract when in use and relax or loosen when not in use but sometimes the muscles stay tight or suddenly contract involuntarily which is a muscle cramp or a spasm. Muscle cramp or spasms are usually caused by overuse, dehydration, deficiency in vitamins and taking certain medications that cause muscle contraction. [youtube url=”https://www.youtube.com/watch?v=Fb3kmHyXtM4″ […]