Sudden confusion, nausea, no history of cold and flu in the elderly, consider posterior circulation ischemia, cerebral blood supply deficiency caused by the patient may also have blood pressure fluctuations, it is recommended that the patient visit the hospital to check the intracranial segment vascular ultrasound, but also to check the blood routine, blood lipid comprehensive judgment of the condition, consider the blood supply deficiency caused by the blood circulation can be given to improve treatment, oral blood Cetron tablets, ginkgo biloba drip pill and other drugs. Low blood pressure can lead to dizziness, unsteadiness, nausea and vomiting; cervical spondylosis can also be considered as a cause of insufficient blood supply to the brain, such as dizziness, visual rotation and nausea, sweating, and discomfort in the neck.