There are many reasons for sudden dizziness with nausea, such as hypertension, hypoglycemia, otolithiasis and so on. 1. High blood pressure: more common dizziness, headache, some people will also be tired, poor mental health, etc., if necessary, you can take some antihypertensive drugs, such as metoprolol, propranolol, etc., it is recommended to take under the guidance of a doctor, usually eat a regular diet, avoid some high salt food intake, help to improve the symptoms. 2. Hypoglycemia: there will be dizziness, nausea, resulting in discomfort, long-term severe hypoglycemia will stimulate the cardiovascular system, promote arrhythmia, etc., appropriate drinking sugar water can relieve the symptoms. 3. Otolithiasis: manifested as sudden strong rotational vertigo, nausea and vomiting, recurrent episodes of vertigo, there may also be panic and anxiety, you can take antivertigo drugs under the guidance of a doctor, such as flunarizine hydrochloride capsules, betahistine mesylate tablets, etc., and usually pay attention to rest to avoid fatigue and so on. If the patient’s condition has not been relieved, it is recommended to go to the hospital for examination and targeted treatment after clarifying the cause.