The main reasons for sudden dizziness, rapid heartbeat and cold sweat are as follows: 1. This may be a hypoglycemic reaction, and the patient may also have a serious feeling of hunger, which is usually seen in patients with diabetes mellitus, when the dosage of glucose-lowering drugs is too high or when the patient is not eating well; 2. Sudden dizziness, rapid heartbeat and cold sweat may also be caused by cervical vertigo. It is mainly caused by insufficient blood supply to the vertebral artery due to the lesion of the cervical spine. The dizziness may be accompanied by pain in the neck, and the dizziness mostly occurs after the patient’s neck activity, and the patient’s imaging examination may reveal problems such as cervical spine reversion, vertebral instability and cervical disc herniation.