There are many reasons for patients to have sudden onset of vertigo, nausea and sweating. If patients have episodes of vertigo, nausea, sweating and visual rotation when they are in a specific position of the head, they are considered to be caused by benign paroxysmal positional vertigo, and the duration of the above symptoms in patients is usually short. If the above symptoms last for a long time and the patient is middle-aged or elderly, cerebral vascular spasm, cerebral blood supply deficiency, cerebral arteriosclerosis and other causes should be considered, and transcranial Doppler examination can be done to clarify. If the patient has panic and palpitations before the onset of the above symptoms, it may be due to insufficient blood supply to the brain caused by cardiac arrhythmia, resulting in the above symptoms. There are also peripheral vertigo, such as vestibular neuronitis and Meniere’s disease which can cause patients to have sudden onset of vertigo, nausea and sweating.