Sudden dizziness and nausea may be related to benign positional vertigo or caused by posterior circulation ischemia, transient ischemic attack, etc. Treatment mainly involves otolith repositioning and application of medication for the primary cause. 1. Benign positional vertigo: It is usually caused by a sudden change of head position, resulting in otolith dislodgment into the semicircular canal, which may cause sudden vertigo, spinning and nausea. Usually, no special treatment is needed. If the symptoms recur frequently and affect daily life and work, otolith reset treatment is needed under the guidance of a doctor. 2. Posterior circulation ischemia: When posterior circulation ischemia attacks, it can lead to brain tissue dysfunction, which may show sudden dizziness, dizziness, nausea, and may be accompanied by limb weakness, inability to stand still and other manifestations. During the acute attack, thrombolytic therapy should be carried out according to the critical condition of the patient, and the commonly used drugs mainly include alteplase, reteplase and so on. 3. Transient ischemic attack: usually due to cerebral atherosclerosis, hyperlipidemia and other risk factors, causing transient neurological dysfunction, it may show sudden dizziness, dizziness, nausea. Antiplatelet aggregation drugs such as clopidogrel and aspirin; and anticoagulant drugs such as dabigatran etexilate can be applied for treatment. Sudden dizziness, dizziness and nausea, if the symptoms occur frequently or continue to be unable to relieve, you should seek medical advice as soon as possible to diagnose the cause and then give targeted treatment. Drugs should be taken under the guidance of a doctor in strict compliance with medical advice.