What Are the Symptoms of Lumbar Muscle Strain?

　　Lumbar muscle strain may present with various symptoms, including dull or aching pain and distension in the lower back, tenderness upon palpation of the lumbar region, restricted lumbar mobility, lumbar muscle stiffness, and fluctuating symptom severity. These manifestations are commonly associated with prolonged bending during labor, poor posture, and chronic lumbar injury. Symptoms typically worsen after physical exertion. If radiating numbness in the lower limbs or abnormalities in bowel or bladder function occur, prompt medical evaluation and treatment are essential.

　　1. Dull, Aching, or Distending Pain in the Lower Back: This is the most common presentation of lumbar muscle strain, with pain primarily localized to the paraspinal muscles on both sides of the lumbar spine. Pain intensifies significantly after prolonged sitting or bending activities and generally improves with adequate rest. Damp, cold, or rainy weather—or exposure of the lumbar region to cold—can also trigger or exacerbate this dull, aching, or distending sensation, interfering with daily activities.

　　2. Tenderness on Palpation of the Lumbar Region: This refers to distinct, localized tender points identified by manual pressure over the lumbar musculature, often located at muscle attachment sites. Pressure elicits intensified aching or soreness, whereas percussion over the lumbar vertebrae typically does not provoke severe pain. This feature helps differentiate muscular strain from bony pathology. Tenderness tends to become more pronounced following physical exertion.

　　3. Restricted Lumbar Mobility: The degree of restriction is usually mild. Activities such as forward bending, backward extension, or rotational movement of the lumbar spine may provoke a pulling or stretching pain, discouraging large-amplitude motion. Complete immobility is uncommon; range of motion typically returns to baseline after muscle relaxation and rest. With recurrent or persistent disease, discomfort during lumbar movement remains ongoing.

　　4. Lumbar Muscle Stiffness: This results from prolonged, sustained muscle tension and spasm. Palpation reveals taut, hardened lumbar musculature. Morning stiffness is particularly noticeable and gradually diminishes with simple lumbar movements. Chronic muscle tension reduces lumbar endurance, making even minor physical activity prone to induce fatigue and aching discomfort.

　　5. Fluctuating Symptom Severity: Fluctuation is a hallmark feature of lumbar muscle strain. Symptoms often improve with rest and appropriate management but readily recur upon resuming habits such as prolonged sitting or repeated bending. The condition typically follows a protracted course characterized by alternating periods of relative remission and exacerbation—not rapidly progressing to severe deterioration, yet persistently impairing daily work and life. Long-term lumbar care is therefore essential.

　　In daily life, maintain proper sitting and standing postures; avoid remaining in one position for extended periods; engage in regular, moderate exercise targeting the lumbar and dorsal musculature; ensure adequate lumbar warmth; and minimize prolonged muscular tension and rigidity in the lumbar region.