Cold weather, heart

This is due to two reasons. First, cold weather is a burden on the lungs, which will lead to the contraction of blood vessels in the lungs, thus putting a burden on the heart. Second, cold weather will excite sympathetic nerves reflexively, and it will also put a burden on the heart. These are physiological reactions, don't worry. Of course, first of all, we must rule out some basic cardiopulmonary diseases.

Please accept it, thank you!