There are many reasons for dizziness when you lower your head, and the common causes are mainly the following: First, insufficient blood supply to the cerebral arteries, when the head is lowered, it is easy to cause contraction and spasm of the muscles in the neck and shoulders, causing dizziness, nausea and vomiting due to insufficient blood supply to the cerebral arteries, taking ginkgo biloba, Chuanxiongzin, drugs to improve brain circulation, can relieve the symptoms. Second, cervical spondylosis is caused by long-term low head work or not paying attention to the protection of the cervical spine, low head is easy to pull the blood vessels and nerves around the neck, causing dizziness, neck soreness and swelling, daily life need to avoid maintaining a fixed posture for a long time, you can do more neck tilt and stretch movements to strengthen the protection of the cervical spine. Third, otolaryngitis, mostly seen in the rotation of the head and position change dizziness, symptoms last for a few seconds to tens of seconds, not more than a minute, can be accompanied by nystagmus, through the position change test, can be clearly diagnosed, the treatment of manual reset can effectively improve the symptoms.