A back spasm happens when the muscles in your back contract involuntarily, causing pain, stiffness, and tightness. They can ...

If you have severe back pain, whether acute, recurring, or chronic (long-term), it may lead to muscle spasms, which are sudden, involuntary contractions of a muscle that can be very uncomfortable.

and I often pay the price with debilitating back spasms. Long-standing conventional wisdom has been to rest completely during pain flare-ups, but several recent studies collected by the British ...