Humidifiers, asthma and allergies

If you or your child has asthma or allergies, talk to a healthcare professional before you use a humidifier. There are some risks.

Cool-mist humidifiers may ease a stuffy nose during a cold. But heated humidified air doesn't seem to have the same result.

Mist from a dirty humidifier may contain bacteria or mold that triggers or worsens asthma and allergy symptoms. High humidity also can cause bacteria or mold to grow.