Sudden dizziness and nausea can be caused by vestibular neuritis, acute cerebrovascular disease, hypertension or Meniere’s syndrome. 1. Vestibular neuritis: it often leads to sudden dizziness and nausea due to compression of the nerves. 2. Acute cerebrovascular disease: If the patient suddenly suffers from dizziness, nausea and vomiting with impaired consciousness, acute cerebrovascular disease such as cerebral hemorrhage should be considered. 3. High blood pressure: it will lead to insufficient oxygen supply to the brain and then sudden dizziness, nausea and vomiting. 4. Meniere’s Syndrome: because of the membrane labyrinth accumulation of water leads to the patient’s sudden rotational vertigo, at the same time may be accompanied by deafness, tinnitus, ear stuffiness, as well as nausea and vomiting, pallor, cold sweating, blood pressure drop and other autonomic reflex symptoms. Sudden dizziness, nausea and vomiting may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, and then give targeted treatment or therapy.