Sudden dizziness and vomiting are mainly due to benign positional vertigo, acute cerebrovascular disease and sleep deprivation, as follows: 1. Benign positional vertigo: The sudden appearance of dizziness and vomiting is mainly related to postural changes, such as sitting up after lying down or turning around for a short period of time, mainly from a few seconds to tens of seconds, so consider the presence of benign positional vertigo. 2. Acute cerebrovascular disease: If an elderly patient with hypertension, diabetes or obesity suddenly becomes dizzy and vomits, the patient should be alerted to the possibility of acute cerebrovascular disease and needs to go to the hospital for a cranial CT or MRI examination. 3. Sleep deprivation: If a patient becomes dizzy and vomits, the patient should be asked if there is sleep deprivation and if there is sleep deprivation. Ask the patient whether there is a lack of sleep, there are some long-term sleep deprived patients, may appear dizzy, vomiting performance.