A back spasm involves a sudden, involuntary muscle contraction that can be set off by something as routine as lifting a bag or sitting for too long. Muscle fatigue, dehydration, and nerve irritation ...

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.(AP) — 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 ...