The pain in the left side of the spine may be caused by trauma, localized fasciitis, localized infection, lumbar disc herniation and other reasons. 1. Trauma: due to trauma and other violent factors lead to local spinal bone and soft tissue injury, the patient may appear spine against the left side of a point of pain. 2. Fasciitis: due to long-term stooping labor and other factors lead to aseptic inflammation of the local fascia, the patient may appear to the left side of the spine a point of pain. 3. Localized infection: due to bacterial and fungal pathogens causing localized infections such as boils and carbuncles, patients may experience pain at a point on the left side of the spine. 4. Intervertebral disc herniation: The herniation of intervertebral discs can cause pain in the left side of the spine due to the irritation of paraspinal nerves. There may be other reasons for the pain on the left side of the spine, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.