Middle back pain affects the thoracic spine—the ... difficulty moving, bruising, and muscle spasms. This type of pain occurs due to injury, such as abrupt, awkward, and twisting motions or ...

A back spasm happens when muscles begin to painfully twinge, seize, or contract. The muscles in your upper, middle, and lower back are divided into three types: intrinsic or deep muscles ...

A back spasm occurs when the muscles in the back involuntarily ... The muscles in the upper, middle, and lower back are categorized into three types: Intrinsic or deep muscles Superficial muscles ...