Lumbar disc herniation causing soreness in the left leg is a sign of worsening symptoms. Lumbar disc herniation is mainly due to the degenerative lesions of lumbar discs leading to disc or nucleus pulposus displacement. The initial symptom of lumbar disc herniation is generally lumbar pain symptoms, when the nerve root is compressed, there will be pain, numbness and other symptoms of the lower limbs, further development of the disease, the calf will appear soreness and weakness, or even limp, unable to walk, at this time, suggesting that the nerve root is severely compressed. The performance of lumbar intervertebral disc herniation is generally the gradual reduction or disappearance of the scope of the pain area, the change of the nature of the pain, and the recovery of muscle strength. For example, the original pain range from the waist to the lower limbs, now the pain is limited to the waist, the original leg numbness has turned into a needle-like pain or the original inability to move the leg or foot can move, which suggests that the lumbar disc herniation improved performance. If the patient’s symptoms of left leg soreness are not relieved, or accompanied by other symptoms, he should go to the hospital in time to see a doctor to clarify the cause and then give targeted treatment.