Pain that starts in the lower back and travels into one or both legs can present as sharp, burning or numb sensations, and may affect people of different ages. The course and urgency depend on underlying causes. Below are common causes, warning signs that need faster evaluation, and which medical specialties typically assess this symptom.
Pain may extend from the lower back to the buttock, thigh, calf or foot. It can be one-sided or bilateral and often comes with numbness, tingling, reduced strength or altered reflexes. Symptoms frequently worsen with coughing, sneezing, bending or lifting.
Nerve root compression from a herniated disc, spinal canal narrowing (stenosis), or inflammation can cause leg radiation. Muscle-related problems such as piriformis syndrome, ligament strains, and referred pain from the sacroiliac joint may produce similar patterns. Less commonly, infection or tumor can underlie the symptom.
Seek urgent medical attention if there is sudden, severe leg weakness, loss of bladder or bowel control, rapidly progressing numbness especially in the saddle area, high fever with back pain, or recent serious trauma. These signs can indicate conditions that require prompt evaluation.
Initial assessment is often by a primary care physician or emergency clinician. Further care may involve neurology, orthopedics, neurosurgery or physical medicine & rehabilitation depending on findings. Evaluation typically includes medical history, focused neurologic and musculoskeletal exam, and when indicated imaging (X‑ray, MRI) or electrodiagnostic tests to clarify nerve involvement.
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