Lumbar pain after being cold may be caused by lumbar muscle tension and spasm, lumbar dorsal fasciitis, lumbar intervertebral disc herniation and other factors. 1. Lumbar muscle tension and spasm: cold stimulation can lead to lumbar blood circulation is affected, blood vessel contraction, local blood supply is insufficient, affecting the metabolism of lumbar muscle tissue, lumbar muscle tension and spasm, causing lumbar pain and discomfort and other symptoms. 2. Lumbar dorsal myofasciitis: localized aseptic inflammation of lumbar dorsal myofasciitis can occur, and cold stimulation can induce inflammation to stimulate the nerves, resulting in pain and discomfort in the lumbar region. 3. Lumbar intervertebral disc herniation: cold can lead to contraction and spasm of the muscles of the lumbar back, which can cause swelling of the soft tissues around the nerve root, leading to increased nerve compression symptoms, and then appear lumbar numbness, pain and so on. After the cold back pain, should promptly consult a doctor to clarify the condition, and under the guidance of specialists to actively carry out appropriate treatment, will help to reduce the symptoms of lumbar discomfort as soon as possible.