1. The incidence of vertigo is 70%~80%. It can be rotational, floating or shaking, and some of them have positional vertigo when they do a certain action in the neck, and the typical ones start to have positional dizziness, which can gradually develop into positional vertigo, and even cannot turn their heads, and they have to fall down when they move, and they can feel the “floor rising” and “turning over with the bed”. When the position that causes dizziness is changed, the symptoms disappear immediately. 2. The incidence of headache is about 70%. It is mostly seen as occipital and top pain, and sometimes it can be radiated to the temporal region, mostly with episodes of distension and throbbing pain, and in severe cases, it can be accompanied by deep facial pain, nausea, vomiting and symptoms of vegetative instability. 3.Sudden collapse is about 5%~10%. Most of them occur when walking or standing, when the head is tilted back and turned excessively, and there may be no aura before the attack. Before the sudden collapse, the lower limbs may feel weak and suddenly fall to the ground, but the consciousness, hearing, vision and speech are not abnormal, and the activities can be resumed after the relief. 4. Tinnitus is mostly bilateral and often feels “intracranial ringing”, like the sound of a torrent rushing, and about 30% are accompanied by hearing loss. 5. About 40% of the cases have vision changes, such as blinking of gold stars, double vision, vision loss, etc., and sometimes sudden amblyopia or blindness. The vision will be restored after a few minutes. 6.Some patients have sensory disorders such as facial tingling, peri-auricular pain, numbness around the mouth and tongue, etc. Occasionally there are phantom hearing or phantom smell. Temporary difficulty in swallowing, irritating cough, abnormal finger sensation, weakness of upper and lower limbs, etc.