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

Pain in the lower ... left back occurs when the muscle fibers overstretch, leading to inflammation. In addition to pain in the lower back, symptoms may include: a limited range of motion muscle ...

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 ...