New York's Village Halloween Parade is an annual holiday parade and street pageant presented on the night of every Halloween in New York City's Greenwich Village.
It Can Trigger Cardiovascular Issues. The cold air makes your body work overtime, especially the lungs and heart, because they work in unison to keep that warm blood circulating without skipping a beat. This can cause blood pressure to rise, as blood vessels constrict so they can get back into the heart.
Its a matter of heat loss. The body needs to stay a certain temperature regardless of sick of not. 99.8 degrees for a average person, give or take a few points. 99-104 when sick, as fever kills the growth of viruses and bacteria. When you breathe in cold air, you're exposing the heated body to cold air. It rapidly cools. Because it rapidly cools, it must burn more calories (use more energy) to generate heat. This can drain the body, which is already fighting infection.