Soreness in the lower back may be lumbar muscle strain, lumbar disc herniation, lumbar spinal stenosis and so on. 1. Lumbar muscle strain: if you often do heavy physical labor, such as porters, etc., it will cause damage to the muscles and ligaments and other soft tissues of the lower back, resulting in soreness. 2. Lumbar disc herniation: the cause of lumbar disc herniation is the degeneration of the lumbar disc, partial or total rupture of the annulus fibrosus will lead to nucleus pulposus protrusion irritation, as well as compression of the nerves to form the low back pain, sciatica, lower limb numbness, and in severe cases, there will be cauda equina syndrome and so on. 3. Lumbar spinal stenosis: If it is congenital hypoplasia of the spinal canal or lumbar spinal stenosis caused by trauma, inflammation and other reasons, it will compress the cauda equina nerve or nerve root to appear lumbar back pain, and some of the patients are accompanied by intermittent claudication and other symptoms. If the symptoms of low back pain are severe, or if the symptoms persist for several days without improvement, the patient should go to the hospital in time for treatment.