The sudden appearance of dizziness and body weakness in patients may be due to the following reasons: 1. It may be a lesion of the nervous system, such as cerebral atherosclerosis, cerebral ischemia or cerebral infarction, cerebral hemorrhage and other diseases. 2. It may be because the patient has a plant nerve dysfunction or has a state of anxiety or depression, and when the patient is rested, poor sleep is prone to sudden onset of dizziness and body weakness. 3. It may be caused by internal 4. It may be caused by insufficient blood supply to the brain due to cervical spondylosis, resulting in sudden onset of dizziness and weakness.