The causes of lumbar disc pain include lumbar muscle strain and fasciitis, herniated disc compressing the nerve root, and disc irritation and hyperplasia. 1. Lumbar muscle strain and fasciitis: patients with lumbar muscle strain or myofasciitis have herniated intervertebral discs, which cause pain and stiffness in the lumbar muscles due to strain, cold and other stimuli. 2. Herniated disc compressing the nerve root: after lumbar disc herniation, the herniated disc or nucleus pulposus and other tissues compress the nerve root of the spinal cord, and the nerve compression is stimulated to cause pain, or the stimulation of the surrounding tissues produces inflammatory substances to cause pain. 3. Intervertebral disc stimulation hyperplasia: After a herniated disc stimulates the surrounding tissues to proliferate, producing chemicals that stimulate the immune system and irritate the small surrounding nerves to cause pain. When you suspect lumbar disc pain, it is recommended to go to the hospital in time to improve the relevant examinations such as lumbar spine CT, MRI, etc., to further clarify the cause of the pain, and standardize the treatment under the guidance of the doctor, so as to avoid aggravation of the symptoms.