Dizziness, also known as vertigo and visual rotation, may be accompanied by nausea and vomiting, and has both central and peripheral causes. First, we should exclude potential and dangerous diseases. 1, acute cerebrovascular disease, such as cerebellar or brainstem infarction, hemorrhagic disease, give patients to do head imaging to avoid delaying the disease. 2, acute myocardial infarction, patients show precordial pain is not obvious, but the onset of dizziness and visual rotation, atypical acute myocardial infarction is easily misdiagnosed. 3, poisoning by poison, gas or drugs. 4, carotid artery or vertebral artery entrapment, the lumen of the blood vessel becomes narrow, and the blood supply to the brain is insufficient or cerebral infarction occurs. Non-life-threatening diseases such as: i. Vestibular neuronitis, in which most patients have a history of a cold half a month ago and dizziness persists and does not resolve; ii. Vestibular migraine, in which patients are dizzy and their symptoms may resolve after sleep and the symptoms do not last more than 72 hours.