Why Does Asthma Increase in Winter?

Asthma symptoms can often worsen in winter for several reasons:

1. Cold, Dry Air: Cold air is dry, and breathing in dry air can irritate the airways and trigger asthma symptoms. The dryness can lead to airway inflammation and increased sensitivity. Carrying a dry-powder inhaler when you go outside in winter is important. However, it is much warmer inside the house.  Installing a whole house dehumidifier with an HVAC system is helpful for accelerating air circulation and fresh air intake.

2. Viral Infections: Winter is a common time for respiratory infections, such as the flu and colds. These infections can exacerbate asthma symptoms and lead to more frequent or severe asthma attacks.

3. Indoor Allergens: People tend to spend more time indoors during the winter, where indoor allergens like dust mites, pet dander, and mold can trigger asthma symptoms.

4. Indoor Heating Systems: Heating systems can dry out the air indoors, irritating the respiratory passages. Additionally, dust and other particles in the air ducts can be circulated when the heating system is in use.

5. Wood-Burning Stoves and Fireplaces: Wood-burning stoves and fireplaces during winter can release particles and irritants into the air, which may aggravate asthma symptoms.

6. Holiday Triggers: The holiday season can introduce additional triggers, such as scented candles, strong odors from decorations, and exposure to irritants during travel.