The causes of dizziness and drowsiness in the back of the head are the following: 1. Consider the performance of neurological disorders, when the patient stays up late or does not sleep enough, the body resistance decreases, when the patient gets cold, it is easy to appear dizziness and drowsiness in the back of the head. 2. The above symptoms of the patient may be caused by cerebral vascular spasm and insufficient blood supply to the brain, which can be clarified by doing transcranial Doppler examination. 3. The dizziness and pain at the back of the head may be related to cervical spine diseases, for example, if patients play cell phones, games or work with their heads down for a long time, the cervical spine muscles will be strained, which will stimulate the vertebral artery and cause insufficient blood supply to the vertebral artery, leading to the symptoms of dizziness and pain and dizziness at the back of the head.