Winter allergy season never truly ends with the calendar, and this year the festive romance of a pine-scented home comes with a warning. Real Christmas trees can harbour dormant mould spores that wake up as soon as the tree is indoors in warm air. This phenomenon, sometimes called ‘Christmas tree syndrome,’ can cause itchy eyes, sneezing, congestion and even breathing difficulties for those sensitive to mould. Dusty decorations stored for months, plus time spent with pets indoors, further amplify these symptoms as outdoor pollen fades away.
As experts note, the indoor environment becomes a prime stage for allergy and irritation when we seal our homes against the chill. Dr Victoria Nguyen, an allergist at The Ohio State University Wexner Medical Center, explains that colder months push people indoors, increasing exposure to common triggers like dust mites and pet dander. Cold air itself can trigger vasomotor rhinitis—nonallergic rhinitis that produces a runny nose and sometimes hives, even without true allergen exposure. For many, these indoor dynamics define the season more than outdoor pollen ever did.
Practical steps start with simple cleaning and air quality improvements: rinse and wipe down real or artificial trees and decorations before bringing them into living spaces; vacuum and dust regularly; use air purifiers with HEPA filters; and maintain modest humidity levels to curb mould and dust mites. Immunotherapy offers longer-term relief for some people, including sublingual tablets, injections into lymph nodes, or traditional allergy shots, though these require a two-to-five-year commitment for full benefit. If symptoms worsen or fail to respond to basic measures, seek professional medical advice.
