Numbness in the back can be caused by cervical and lumbar spine diseases, thoracic spine small joint dislocation, intercostal neuritis and other diseases. 1. Cervical spine and lumbar spine diseases: Long-term low head or stooping posture can lead to cervical spine and lumbar spine osteophytes, and compression of the nerves can lead to localized pain, numbness and other uncomfortable symptoms. 2. Thoracic spine small joint dislocation: long-term stooping, arching the back and other postures, can lead to the small joints of the thoracic spine dislocation, joint dislocation can cause thoracic spine joint hyperplasia, compression of the intercostal nerve can lead to numbness in the back area. 3. Intercostal neuritis: viral infection or nerve stimulation can lead to the occurrence of intercostal neuritis, local nerve demyelination lesions, which can cause localized numbness in the back area. When the back numbness should be timely medical treatment, under the guidance of specialists to actively carry out appropriate treatment, help to reduce the numbness of discomfort symptoms as soon as possible.