Blood pressure can rise to some degree in winter due to the cold weather. Studies have found that blood pressure changes with the weather. People of all ages exhibit elevated blood pressure, both systolic and diastolic, during the cold weather of winter. This is because the cold causes the capillaries to constrict and the body experiences a stress response to deal with the cold, leading to an increase in blood pressure. All of this winter cold weather blood pressure elevation is temporary and transient. They are relieved by going to a warm room and should be kept warm in winter. The diagnosis of hypertension generally requires three measurements on non-simultaneous days of systolic blood pressure ≥ 140 mmHg and/or diastolic blood pressure ≥ 90 mmHg. A diagnosis of hypertension should be made in a timely manner to avoid delaying the condition.