[Skip to Content]

Asthma Triggers

What Are Asthma Triggers?

One way to help manage your child's asthma is to avoid asthma triggers. These are things that are harmless to most people, but can cause flare-ups in kids with asthma.

Common asthma triggers include:

Other, less common triggers include laughing, crying, and use of some medicines.

Kids can't avoid all triggers all the time. But lessening exposure whenever possible can help keep asthma symptoms under control.

What Are My Child's Asthma Triggers?

Triggers are different for each child. Some might cause asthma symptoms only at particular times of the year and even stop being a trigger as kids get older.

You'll work with your doctor to determine your child's triggers. The doctor may suggest keeping an asthma diary to record your child's symptoms, medicines, and peak flow readings. You can also write down when and where symptoms happened to help you identify possible triggers.

If your doctor thinks allergens are triggers, your child might need an allergy skin test.

How Can We Avoid Asthma Triggers?

If Allergens Are a Trigger

Allergens are one of the most common asthma triggers. They include:

It's impossible to avoid all allergens, but you can minimize them in your home. Focus on the rooms where your child sleeps and plays:

If Irritants (Pollutants) Are a Trigger

Irritants can affect anyone — even someone who doesn't have asthma. They're not usually a serious problem, but for kids with asthma, they can lead to swollen airways and flare-ups.

Common irritants include:

Here are some ways to reduce household irritants:

Preventing Infections

Respiratory infections, such as colds or the flu, can be hard to avoid. For kids with asthma, breathing problems triggered by colds can last days or even weeks after the cold has gone away.

Teach everyone in your family the importance of hand washing. Kids 6 months and older should get the annual flu vaccine. This is especially important for kids with asthma, who are at greater risk for health problems if they get the flu.

If Extreme Weather Is a Trigger

Some weather conditions can trigger asthma flare-ups, including:

If weather conditions are a trigger, keep an eye on the forecast and limit your child's time outdoors on problem days. If cold weather is a trigger, cover your child's nose and mouth with a scarf. If hot, humid weather is a problem, keep your child in an air-conditioned environment.

In some cases, your child's medicine dose may need to be increased.

If Exercise Is a Trigger

Exercise might be the only trigger for some kids with asthma. Along with allergens, this is one of the more common triggers. It can be a particular problem in someone whose asthma isn't well managed. But this is one trigger that your child should not avoid because exercise is important for overall health.

Don't discourage being active or playing sports. Instead, talk with your doctor about what your child should do before, during, and after exercise. This may include taking medicine before working out or playing a sport.

If Reflux Is a Trigger

Gastroesophageal reflux is when the contents of the stomach flow backward into the esophagus. Some kids also inhale these contents into the lungs, which can harm airways and make asthma worse.

If reflux is a trigger, treating it can help your child's asthma symptoms.

Date reviewed: September 2017

Note: All information on KidsHealth® is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

© 1995- The Nemours Foundation. All rights reserved.

Images provided by The Nemours Foundation, iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and Clipart.com