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 ...

If you have neck or back pain, or you’re dealing with some other condition that causes muscle spasms, your doctor might ... it is common to have side effects. Some muscle relaxants, however ...

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 ...

Neck pain on the left side usually results from a benign cause, like muscle strain from sleeping in an awkward position. Sometimes, a more serious cause may be a tumor or rheumatoid arthritis.