Sudden vertigo and nausea may be caused by otolithiasis, Meniere’s disease, vestibular neuronitis, etc. Patients can undergo positional test, audiological examination, vestibular function examination, imaging examination and other examinations. 1. Otolithiasis: For sudden dizziness and nausea caused by otolithiasis, patients can follow the doctor’s instructions to carry out positional test, audiological examination, imaging examination, balance examination, positional evoked test and so on. If the patient’s test results are abnormal, he may have otolithiasis. 2. Ménière’s disease: Ménière’s disease can also lead to sudden dizziness and nausea. The patient can follow the doctor’s instructions for audiological examination, vestibular function examination, balance function examination, tinnitus examination, imaging examination, etc. If the examination results are abnormal, the patient may have otolithiasis. If the examination is abnormal, the patient may have Meniere’s disease. 3. Vestibular neuronitis: Vestibular neuronitis can also cause sudden dizziness and nausea, and the patient can follow the doctor’s instructions to carry out imaging tests, vestibular function tests, etc. If the test results are abnormal, the patient may have Meniere’s disease. If the test results are abnormal, the patient may have vestibular neuronitis. When the patient has the symptoms of sudden dizziness and nausea, he should consult a doctor in time to improve the examination and then targeted treatment.