Dizziness, nausea and sweating that start suddenly are considered to be related to hypoglycemia, insufficient blood supply to the brain, and vertebral artery cervical spondylosis. Sugary drinks, medication and surgery can be given. 1. Hypoglycemia: Diabetic patients taking too much hypoglycemic drugs, or ordinary people eating too little, may cause hypoglycemic reaction, resulting in dizziness, nausea, sweating. It is recommended to eat properly, take sugar water, eat sugar cubes can help relieve. Proper rest is recommended, 2. Insufficient cerebral blood supply: Patients with cerebrovascular diseases and a long history of atherosclerosis may cause insufficient cerebral blood supply, resulting in sudden dizziness, nausea and sweating. Immediate rest, oral flunarizine, ginkgo biloba drops, etc. are recommended to help relieve symptoms, and endovascular intervention if necessary. 3. Vertebral artery-type cervical spondylosis: A herniated cervical disc compresses the vertebral artery, which may lead to the blood supply to the brain causing the above symptoms, requiring rest and surgical treatment. Suddenly start dizziness, nausea and sweating, but also to understand whether it is related to epilepsy, hypertension, ischemia, infection and other factors. It is recommended not to blindly use drugs, you can go to the hospital neurology department to find the cause.