The most common cause of lower back pain is mechanical injury or irritation, specifically in the form of lumbar muscle strains or ligament sprains. The lower back, or lumbar region, bears the vast majority of the upper body’s weight and undergoes constant twisting, bending, and motion throughout the day. When these supporting soft tissues are stretched beyond their normal limits, microscopic tears can develop in the muscle fibers or tendons. This mechanical failure triggers an acute local inflammatory response, which leads to painful muscle spasms, stiffness, and localized tenderness as the body tries to immobilize and protect the injured area. [1, 2, 3, 4]
These strains and sprains are typically driven by a combination of everyday activities and lifestyle factors rather than severe trauma. Poor body mechanics during heavy lifting, sudden awkward twisting movements, or a sudden overload on unconditioned muscles are frequent triggers. Furthermore, broader lifestyle hazards identified by organizations like the Mayo Clinic and the National Institutes of Health (NIAMS)—such as poor posture from prolonged sitting, a sedentary lifestyle that weakens core muscles, and excess body weight—greatly exacerbate this vulnerability. Fortunately, because these common episodes are musculoskeletal rather than structural, they are typically self-limiting and resolve on their own within a few days to a few weeks with activity modification and basic self-care. When it doesn’t – call us.