The causes of elevated blood pressure during the change of season include physiological factors such as exertion, weather changes, and pathological factors such as primary or secondary hypertension. 1. Physiological factors: The temperature difference during the change of season is large, and the sudden change of temperature can easily cause the contraction and diastole of blood vessels, which will lead to fluctuation of blood pressure. If the blood pressure rises only temporarily during the change of season, pay attention to rest and keep warm. Normally, you should pay attention to monitoring blood pressure. 2. Pathological factors: the diagnosis of hypertension is based on three measurements of blood pressure not taken on the same day, with systolic blood pressure ≥140mmHg and/or diastolic blood pressure ≥90mmHg. If blood pressure rises only once in a while, it does not meet the diagnostic criteria of hypertension. In addition, secondary hypertension can occur in endocrine diseases and renal diseases. You should seek prompt medical attention if you suffer from hypertension.