Back spasms are involuntary muscle contractions. They can happen because of muscle weakness, overuse, or injury. Muscle strains can cause sudden pain and spasms, often occurring in the lower back from ...

ORLANDO, Fla. — Rory McIlroy withdrew from the third round of the Arnold Palmer Invitational on Saturday when he felt muscle spasms in his back that were not going away. The spasms were not thought to ...