The common causes of half of the body sinking are: cervical spondylosis, spinal cord lesions, cerebrovascular diseases and so on. 1. Cervical spondylosis: usually seen in patients with cervical disc herniation and cervical spondylolisthesis, when keeping a bad posture for a long time, it is easy to cause the local nerve roots to be compressed, which in turn causes the sensory disorder of half of the body, manifesting as half of the body sinking, usually accompanied by numbness, weakness, neck and shoulder discomfort and other symptoms. 2. Spinal cord lesions: most common in optic nerve myelitis, spinal cord intramedullary and extramedullary tumors, etc., due to damage to the spinal cord, resulting in damage to the nervous system and compression, which leads to the phenomenon of half of the body heavy, numbness. 3. Cerebrovascular diseases: such as cerebral hemorrhage, cerebral infarction and other diseases. Due to local cerebrovascular hemorrhage or ischemia, the local cerebrovascular can not get enough blood supply, which leads to the damage of local central neurons or fiber bundles, resulting in limb movement disorders, appearing half of the body is heavy, but also can be accompanied by dizziness, headache, numbness and other symptoms. In short, when half of the body sinks, and the symptoms persist, it is recommended to go to the hospital in time to identify the cause of the targeted treatment.