Numbness in the back may be a sign of the following diseases: First, cerebrovascular disease, which can appear on one side of the back, mostly numbness and weakness of the lateral limbs, and may be accompanied by dizziness, blurred vision, clumsy language, etc. The diagnosis can be made clearly by head MRI or CT. Second, cervical spondylosis, cervical spine osteophytes, ligament calcification, etc. can also lead to numbness in the back, which can be clearly diagnosed by cervical spine X-ray or cervical spine MRI. Third, patients suffering from back fasciitis, after prolonged exertion will also appear back numbness symptoms. Fourth, lung diseases, such as inflammation, tuberculosis or occupying lesions, may also radiate to the back and cause numbness, often on one side of the lesion site numbness.