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

The most common cause of low back pain on the left side is a muscle strain ... experience a stabbing pain, or have muscle spasms, says Michael Rosner, MD, a neurosurgeon at George Washington ...

Many of the most common and accepted explanations include sleep deprivation, dehydration, too much caffeine, stress, a pinched nerve, or as a side ... back spasms, if your muscles are twitching ...