Cleveland Clinic: This Is The Surprising Reason Allergies Spike in Early December

‘Tis the season for sniffling, sneezing, and wheezing—as one pediatrician just shared, respiratory viruses are “wreaking absolute havoc” in the ER right now. Yet symptoms like cough and congestion can bubble up for another reason: Cleveland Clinic experts say a cherished holiday ritual—bringing home a Christmas tree—can cause an unexpected symptom spike.

While true pine tree allergies are rare, there are several other reasons that trees, both real and artificial, can spark a flare-up at this time of year: “Trees can have weed pollen, mold, and even critters hiding in them,” explains Dr. DeVon Preston, MD, a Cleveland Clinic allergist. “Unless you shake it out or wash it off properly, there’s a high potential you’ll release mold and other pollens into your home,” he notes. 

In fact, studies cited by the American Christmas Tree Association show that a single tree can harbor roughly 50 types of mold and boost indoor mold counts more than sixfold. They recommend rinsing your tree with a hose, then “leaving the tree somewhere warm to dry for a couple of days before bringing it into the house.” Alternatively, you can use an air compressor to blow off debris, avoiding the need to dry the tree afterward, they advise. 

Timing matters, too: keeping a real tree past its prime gives mold more opportunity to spread. “The longer you keep your tree up, the longer mold has to grow and release more spores,” Dr. Preston says. “I recommend getting rid of your tree somewhat immediately after the season’s over.” He adds that waiting until January to take it down is “just letting mold fester.”

Experts from UCLA Health add that fragrant terpenes, compounds found in sap that are responsible for that classic “Christmas tree smell,” can irritate sensitive sinuses when inhaled or touched. Those with terpene allergies may also experience skin rash in addition to their other symptoms. 

Artificial trees aren’t a guaranteed safe haven, either—Cleveland Clinic allergists emphasize that without proper cleaning, both tree types can release allergens into the air the moment they’re set up. When stored improperly, they can accumulate dust and mold just like their natural counterparts. Pests such as mice or cockroaches can also leave droppings in their branches, which can further exacerbate an allergic response. Some artificial materials themselves may irritate especially sensitive individuals. 

Not so cheery, but a few preventive steps can dramatically cut allergen levels, and keep you holiday spirits high. Besides cleaning your tree before bringing it inside, Dr. Preston recommends:

• Dusting off any ornaments or trimmings you plan to decorate with
• Running an air purifier near your tree 
• Storing artificial trees and ornaments in airtight containers between seasons

If after that, you’re still experiencing a seasonal surge of the sniffles, other Christmas decor could be to blame. Managing other irritants—like your fireplace or scented candles—can also reduce symptoms. If problems persist, consult your PCP or an allergist.

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