Lumbar pain may be caused by lumbar muscle strain, lumbar intervertebral disc herniation, trauma and so on. 1. Lumbar muscle strain: it refers to the lumbar overwork due to long-term labor, excessive exercise, poor posture, etc., the lumbar muscle is in a state of long-term tightness, so that the lumbar soft tissues of chronic injury caused by inflammatory changes leading to pain in the lumbar region. 2. Lumbar intervertebral disc herniation: due to degenerative changes or traumatic injuries caused by structural changes in the intervertebral discs, common symptoms include lumbar pain, radiating pain in the lower limbs caused by nerve compression, etc. Lumbar pain can be triggered or aggravated by exertion of the lumbar region. 3. Trauma: If there is a history of trauma, it may cause local soft tissue injury or fracture, etc., without timely treatment or rest, it will induce and aggravate lumbar pain after exertion. There may be other reasons for the pain when exerting oneself. It is recommended that the patient should go to the hospital in time for imaging examination to clarify the cause of the disease and take appropriate treatment measures under the guidance of the doctor.