 only have headaches or migraine problems in the summertime heat. I never asked them if they were putting a cold pack on the back of their head, but I'm going to ask them from now on. He says that's dangerous. All right, number three, cold showers when you're sweating. When your body is covered in sweat, your pores are wide open. Cold water or air can then rush in, potentially leading to rheumatic arthritis in the future.