Do I need to reduce my blood pressure medication as the weather warms up? Most people do not need to. However, if your blood pressure drops significantly or you experience symptoms such as dizziness, weakness, or darkness before your eyes, you should take your blood pressure and consult your doctor promptly. Everyone’s blood pressure fluctuates constantly, and this is especially true for people with high blood pressure. There are many factors that affect blood pressure levels, and the change of seasons is one of the most common causes. Generally speaking, in winter the blood vessels in the human skin contract due to the lower ambient temperature, resulting in higher blood pressure; in the warm season, especially in summer, the opposite is true, as the ambient temperature is higher, the blood vessels in the skin expand significantly, resulting in lower blood pressure. In addition, we tend to sweat more in summer, which reduces the blood volume in the blood vessels and can also cause blood pressure to drop. For healthy people, the fluctuation of blood pressure in different seasons is a normal phenomenon, which is a process of interaction between the body and the external environment and has no adverse effect on health. However, in patients with hypertension, the fluctuation of blood pressure caused by the change of seasons may be larger, which will significantly increase the difficulty of controlling blood pressure.