How to Use a Humidifier to Relieve Summer Allergies and Sinus Congestion

Summer is peak allergy season for many people. The combination of pollen, mould, and irritants in the air can cause allergy and sinus symptoms, such as sneezing, coughing, congestion, and more. Using a humidifier is one way to get relief during this season.

What Causes Summer Allergies?

Allergies get worse in summer because plants release more pollen. Grass pollen peaks in late spring and early summer, while tree pollen peaks in spring but can last into summer. Mold spores thrive in the warmer, more humid summer air. 

These allergens and irritants cause an immune reaction in people with allergies. This triggers allergy symptoms like:

  • Runny nose

  • Sneezing 

  • Itchy, watery eyes

  • Congestion and sinus pressure

  • Cough

  • Headache

  • Fatigue

How Humidifiers Help Relieve Symptoms

Humidifiers add moisture back into dry air. This can provide relief for several reasons:

1. Moisture traps allergens.

Dry air allows allergens to float freely. Adding moisture causes the particles to stick together and fall out of the air instead of being inhaled.

2. Moisture soothes irritated membranes. 

The added humidity coats and soothes irritated sinuses, throat, and airways, helping to reduce coughing and congestion.

3. Moisture prevents dehydration.

Staying hydrated helps thin mucus secretions. Dry air can dry out and inflame sinuses, but extra moisture prevents this dehydration.

Choosing the Best Humidifier for Allergies

  1. Cool mist 

Cool mist humidifiers are often more beneficial for individuals with allergies. They add moisture to the air, helping to relieve dryness and soothe irritated nasal passages without introducing additional particles.

  1. Daily cleaning

Change the water and clean the tank daily to prevent mould growth, which can also trigger allergies. 

  1. Large tank capacity

Look for a tank with at least one-litre capacity so that you can refill it less often. For the best relief, run it all day and all night.

Tips for Getting the Most Benefit

Follow these tips to maximise the allergy and sinus relief from your humidifier:

  • Place it near your bed - Keeping it in the bedroom helps relieve nighttime symptoms so you can sleep better.

  • Add essential oils - Put a few drops of menthol or eucalyptus oil in the tank for extra decongestion.

  • Try a saline rinse - Saline washes also hydrate nasal passages. Use it along with the humidifier. 

  • Clean your environment - Vacuum and dust regularly to minimise irritants. Replace HVAC filters often.

  • See an allergist if needed - They can identify your triggers through allergy testing and provide prescription medications for lasting relief.


Using a humidifier, particularly a cool mist model, can significantly help manage summer allergies and sinus congestion. If you're looking for one, MedeScan offers options that cater to your needs. Our Rainbow Mist Top Fill Ultrasonic Cool Mist Humidifier is designed for your health and comfort. It has a 2.8L capacity, providing up to 20 hours of use, an integrated aromatherapy diffuser, customisable LED night lights, and quiet, energy-efficient operation for a peaceful atmosphere. Shop now!

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