Dizziness in winter may be caused by insufficient blood supply to the brain, high blood pressure, cold and other reasons. 1. Insufficient cerebral blood supply: Dizziness in winter may be caused by insufficient cerebral blood supply, because the temperature outside is relatively low in winter, and blood vessels are prone to temporary spasms when the weather is cold, which will cause insufficient cerebral blood supply, leading to dizziness and nausea in patients. 2. Hypertension: Severe hypertension can cause hypertensive encephalopathy, and patients can experience symptoms of dizziness. In winter, when the temperature is relatively low, it can cause peripheral vasospasm, leading to increased blood pressure, thus causing dizziness as a complication. 3. Cold and flu: mainly caused by bacterial, viral and other infections, but can also be induced by cold, over-fatigue and other factors, dizziness, headache, accompanied by coughing, runny nose, sneezing, fever and other symptoms. In addition, other conditions can also lead to dizziness in winter, you should go to the hospital in time for examination, after clarifying the cause of the disease, under the guidance of the doctor to deal with it accordingly.