1. Stuffy Nose
Dry air can commonly cause nasal congestion, according to Health magazine. The body naturally humidifies air before it enters the lungs, but in cold conditions, it ramps up mucus production to help the process. When the air is too dry, this extra mucus can thicken and build up in the sinuses. According to the source, dry air also sucks moisture out of your system with each breath you take, making the problem even worse. To combat these effects, drink plenty of water and consider using a humidifier at night so you're not losing hydration as you sleep.