Medically reviewed by Dr. Bayo Curry-Winchell, MD, MS, Urgent Care Medical Director and Family Medicine Physician
+ Infographic text Why is asthma often worse in the winter?
Cold air can trigger spasms in the muscles that keep your airways open. These spasms can trigger asthma flare-ups.
Dryness in the air, as often happens in the winter, can irritate your airways, cause coughing and problems breathing.
Changes in air pressure Even in warmer climates, unstable weather during winter months can create fluctuations in air pressure which can trigger asthma symptoms. Wind and rain can also stir up asthma triggers such as mold spores.
Exercise Exercising in cold weather can trigger asthma symptoms or make them worse. You’re more likely to breathe through your mouth when you exercise, but when you do that in the cold, it can force cold air directly into your airways and dry out the mucus lining of your bronchial tubes.
Respiratory illnesses In the winter, col..