Dizziness from turning from side to side may be related to benign positional vertigo or due to cerebral arteriosclerosis, cervical spondylosis and other causes. 1. Benign positional vertigo: also known as otolithosis. If there is a big change in the position of the head when turning from side to side, it is easy to cause the otolith particles to fall off. When the otolith falls off to the semicircular canals, it may cause dizziness, which may also be accompanied by rotating of vision, nystagmus and other manifestations. 2. Cerebral arteriosclerosis: usually caused by hypertension, hyperlipidemia and other underlying diseases, which can lead to narrowing of blood vessel lumen and thickening of blood vessel wall, resulting in slowing down of blood flow, causing the brain not to get sufficient blood and oxygen supply. In this case, turning around is likely to aggravate the insufficient blood supply to the brain and cause dizziness. 3. Cervical spondylosis: especially the existence of cervical disc herniation patients, in the left and right turn over easily lead to the protruding cervical disc compression of local blood vessels, resulting in the vertebral basilar artery blood supply is insufficient, which may cause dizziness left and right turn over. Dizziness may also be caused by other reasons. If the symptoms recur frequently, you should consult a doctor as soon as possible to diagnose the cause of the dizziness and get treatment under the guidance of a doctor.