Patients who have been dizzy and nauseous need to be alert to posterior circulation ischemia, hypertension, Ménière’s disease or other diseases, as follows: First, posterior circulation ischemia: the most common is posterior circulation ischemia. Posterior circulation ischemia includes causes such as cerebral artery hypoperfusion and cerebral infarction, especially cerebral infarction, which is a more dangerous condition and requires immediate hospital consultation. Second, hypertension: especially malignant hypertension, when the blood pressure is particularly high, can induce hypertensive encephalopathy, resulting in dizziness, nausea, vomiting and other phenomena in patients. Third, Ménière’s disease: Ménière’s disease is also known as vertigo. Patients with vertigo usually have dizziness, nausea and vomiting, accompanied by tinnitus, hearing loss, etc. Fourth, other diseases: vestibular neuritis can also appear all the time dizziness, nausea and other phenomena, in addition to some other causes, such as low blood pressure, and some patients because of food poisoning, etc., can also cause dizziness, nausea.