Dirty air can be bad news for someone with asthma. Find out more in this article for kids.

Weather can affect a person's asthma. Find out how in this article for kids.

Kids who have allergies also might have a breathing problem called asthma. Find out more in this article for kids.

Uh-oh. Could your pet be making your asthma worse? Find out more in this article for kids.

Smoking - or even breathing in secondhand smoke - can make asthma worse. Find out more in this article for kids.

If you have asthma, you want to breathe easy at home. Find out how in this article for kids.

When things are confusing, a plan really helps. Check out this asthma action plan, which you can print out and use to manage breathing trouble.

Use this weekly diary to record your child's asthma symptoms, peak flows, the amount of medicine taken.

A spirometry test is as easy as blowing out birthday candles. Watch how the test is done in this video for kids.

Kids who have asthma need to take medicine. But what kind of medicine do they take and what does it do? Let's find out.

People use inhalers and nebulizers to get asthma medicine into their lungs. Find out more in this article for kids.

Weather can affect a person's asthma. Find out how in this article for kids.

Smoking - or even breathing in secondhand smoke - can make asthma worse. Find out more in this article for kids.

Packing for a trip? If you have asthma, you'll want to be prepared so breathing trouble doesn't spoil your fun. Find out more in this article for kids.

Take a look inside a person's lungs when asthma is making it hard to breathe.

When something keeps the air from moving in and out of the airways in your lungs, it's called an airway obstruction.

The airways in your lungs are like tubes or straws.

An allergen is a medical word for anything that causes an allergic reaction.

Imagine if you were always sneezing because you were allergic to something.

Most kids who have asthma also have some kind of allergy, too.

All warm-blooded animals shed tiny flakes from their skin. This is called dander.

Someone with asthma can have trouble breathing because of problems with the airways, the tubes that carry air into the lungs.

Lots of stuff goes more smoothly when you have a plan - and that includes dealing with asthma.

When a person has a lot of trouble with wheezing, coughing, or shortness of breath, it's called an asthma flare-up, or attack.

These tubes, or airways, let air in and out of your lungs, so you can breathe.

Actually, bronchoconstriction affects the airways in a person's lungs.

A person with asthma may need to take a medication called a bronchodilator - something that dilates (a fancy word for opens) the airways, or bronchial tubes.

Controller medicine keeps the airways in the lungs open and clear so kids with asthma can breathe.

A cough is a reflex that helps your body clear your throat and lungs.

Dust mites are teeny, tiny bugs that live in household dust.

Some people have asthma symptoms (such as coughing, wheezing, or trouble breathing) only when they're doing sports or being active.

Histamine is a substance in the body that's released during an allergic reaction.

An inhaler, also called a puffer, is a plastic tube that holds a container of medicine that comes out in a spray and is breathed into the lungs.

Many people with asthma need to take medicine every day to control their asthma.

How well do your lungs function? In other words, how well are you breathing?

A nebulizer may sound like a space gun, but you don't have to be on a spaceship to use it.

Lots of kids who have asthma use a special tool called a peak flow meter to measure how quickly they can push air out of their lungs.

Pollen is a fine powder produced by certain plants.

Quick-relief medicines are a type of asthma medicine that works quickly.

Retractions are a sign someone is working hard to breathe.

A spacer makes it easier to use an inhaler.

A spirometer is an instrument that measures how well your lungs are working.

Sulfites are food preservatives that can cause breathing difficulties in some people with asthma.

With asthma, a trigger is anything that brings on asthma symptoms, such as coughing, wheezing, and trouble breathing.

A wheeze is the whistling sound air makes when your breathing tubes are narrowed.