The symptoms of dizziness as soon as you sit up can be caused by the following reasons:1. It may be related to the change of body position. If you lie down for a long time and get up suddenly, the blood pressure will drop leading to insufficient blood supply to the brain, thus the symptoms of dizziness will appear.2. If you suffer from cervical spine diseases, such as cervical disc herniation, intervertebral stenosis and so on, dizziness and vertigo may also occur when you sit up.3. If you have obvious vertigo, Nausea, vomiting, may be related to suffer from vertigo, but also may be related to vestibular problems caused by otolithiasis or Meniere’s syndrome, anemia, low blood sugar, etc. 4, the symptoms of dizziness will appear when sitting up, may be related to the night often stay up late, resulting in body fatigue or qi and blood deficiency. 5, suffers from cerebral arteriosclerosis, cerebral blood supply insufficiency, etc., may also appear dizziness, the patient can go to the hospital to examine The patient can go to the hospital for examination to determine the cause of the disease before treatment.