When it’s cold outside, your blood vessels constrict (narrow) to keep your body warm. Your blood vessels also narrow when they are clogged and during stressful times. Eventually, this can lead to high blood pressure. High blood pressure, or hypertension, can increase your stroke risk. It is, therefore, no surprise that a recent study found that extreme weather changes correlate with an increase in hospital admissions for stroke. Although there is not much that can be done about the weather, researchers think that there are preventive measures you can take. One is to stay as warm as possible when it’s cold outside.