- Parents Home
- Allergy Center
- Asthma Center
- Cancer Center
- Diabetes Center
- A to Z
- Emotions & Behavior
- First Aid & Safety
- Food Allergy Center
- General Health
- Growth & Development
- Flu Center
- Heart Health
- Helping With Homework
- Diseases & Conditions
- Nutrition & Fitness Center
- Play & Learn Center
- School & Family Life
- Pregnancy & Newborn Center
- Sports Medicine Center
- Doctors & Hospitals
- Para Padres
- Kids Home
- Asthma Center for Kids
- Cancer Center for Kids
- Movies & More
- Diabetes Center for Kids
- Getting Help
- Puberty & Growing Up
- Health Problems of Grown-Ups
- Health Problems
- Homework Center
- How the Body Works
- Illnesses & Injuries
- Nutrition & Fitness Center for Kids
- Recipes & Cooking for Kids
- Staying Healthy
- Stay Safe Center
- Relax & Unwind Center
- Q&A for Kids
- The Heart
- Videos for Kids
- Staying Safe
- Kids' Medical Dictionary
- Para Niños
- Teens Home
- Asthma Center for Teens
- Be Your Best Self
- Cancer Center for Teens
- Diabetes Center for Teens
- Diseases & Conditions (for Teens)
- Drugs & Alcohol
- Expert Answers (Q&A)
- Flu Center for Teens
- Homework Help for Teens
- Infections (for Teens)
- Managing Your Medical Care
- Managing Your Weight
- Nutrition & Fitness Center for Teens
- Recipes for Teens
- Safety & First Aid
- School & Work
- Sexual Health
- Sports Center
- Stress & Coping Center
- Videos for Teens
- Para Adolescentes
What Is Asthma?
What Is Asthma?
Asthma is a condition that affects the airways. People with asthma have breathing problems that come and go. They may cough, wheeze, or be short of breath. This happens because airways get swollen, narrowed, and filled with mucus.
Asthma is common in kids and teens and tends to run in families. It can be mild or so severe that it gets in the way of daily activities.
With medicine and the right care plan, asthma symptoms can be managed so that kids and teens can do just about anything they want to do.
What is Asthma?
Learn what asthma is and how it is treated.
What Causes Asthma?
No one knows exactly why some people develop asthma. Experts think it might be due to a combination of things in the environment and a person’s genes.
People with asthma may have a parent or other close relative with asthma. It’s also more likely in people who have allergic conditions (such as eczema, hay fever, and food allergies) or are overweight or obese. Events early in life seem to be related to a person developing asthma later, such as premature birth, low birth weight, exposure to cigarette smoke, and getting sick with some types of viral infections.
How Does Asthma Affect Breathing?
Normally, when someone inhales (breathes in), air goes in through the nose or mouth, down the trachea, and into the airways of the lungs. When people exhale (breathe out), air exits the body in the opposite direction.
In asthma, the airways are always a little inflamed (irritated and swollen), even when a person has no symptoms. They’re also quick to react to certain things (“triggers”) that make them get even more inflamed, swollen, and filled with mucus, blocking the flow of air. The muscles around the airways tighten, making them even narrower, which makes it very hard to breathe. When this happens, it is called an asthma flare-up or asthma attack.
Triggers vary from person to person, but common ones include:
- respiratory infections, like colds or the flu
- allergies to things like pollen, mold, and pet dander
- irritants and pollutants in the air, like cigarette smoke or smog
- weather conditions, like cold and dry air, or hot and humid air
- strong emotions, like laughing, crying, or feeling stressed
What Are the Signs & Symptoms of Asthma?
Asthma symptoms include:
- a cough, especially at night or while active
- trouble breathing
- a tight chest
Some kids might not have asthma symptoms at all between flare-ups. Others might always have mild symptoms that get worse during a flare-up. Some flare-ups are mild, but others can be serious. They can happen suddenly, but usually build up over time.
Asthma Flare-ups: What Happens
Learn what asthma is, what happens during an asthma flare-up, and how to control and live with asthma.
How Is Asthma Diagnosed?
To diagnose asthma, doctors will ask questions about a child's health, problems with breathing, and family medical history. They'll also ask about any allergies, illnesses, and exposure to things that may make breathing worse.
Kids will get an exam and may have a lung function test. This usually involves testing breathing with a spirometer, a machine that analyzes airflow through the airways.
How Is Asthma Treated?
There's no cure for asthma, but it can be managed to prevent flare-ups. Some kids can outgrow asthma as they get older, but it’s still important to have it under control early in life. Asthma treatment involves two important things: avoiding triggers and taking medicine.
There are many ways to avoid triggers after they’re identified. Your doctor will work with you to come up with a plan to help your child avoid them.
For example, if pet dander or mold in your home trigger your child's asthma symptoms, you can make your home asthma-safe by changing the linens often, vacuuming regularly, and keeping the family pet out of your child's bedroom. If outdoor allergies like pollen are a problem, your child should avoid the outdoors on days when pollen counts are high.
If exercise is a trigger, the doctor may prescribe a medicine for your child to take before physical activity to prevent airways from tightening up. It’s important for people with asthma to stay active and not avoid physical activity. Exercise can help them stay healthier overall (in fact, many pro athletes have asthma).
It's also important to get a yearly flu vaccine and a COVID-19 shot, as illnesses like these can trigger asthma flare-ups.
Most asthma medicines are breathed directly into the lungs (inhaled), but some are pills or liquids. Asthma medicines generally work in two ways:
- Bronchodilators work right away to relax the muscles around the airways and open them, providing quick relief of symptoms. That's why they're often called quick-relief, "fast-acting," or "rescue" medicines.
- Anti-inflammatory medicines work over time to ease inflammation, which reduces swelling of the airways and limits mucus production. They usually need to be taken every day, even when a person feels fine and has no symptoms. These are often called long-term control, "controller," or "maintenance" medicines. Some kids with mild asthma might use anti-inflammatory medicines only during times of increased symptoms instead of every day.
Some kids will get both types of medicines from one inhaler device. They might need to use this “combination” inhaler every day, with added doses from it when they have symptoms. Some older kids with mild asthma might use a combination inhaler only for quick relief when they have symptoms, or before they exercise. Your health care team will be able to help you figure out which inhaler is best for your child, and how and when to use it.
During a more severe flare-up, sometimes a doctor will prescribe oral (taken by mouth) steroids for 5–7 days. These work more quickly to reduce inflammation when inhaled medicines aren’t quite enough.
What Else Should I Know?
Asthma care can seem like a lot, especially at first. But many tools are available to help you care for your child.
An asthma action plan is a care plan that you'll develop with the doctor. The plan gives detailed instructions on how to manage asthma, including:
- what medicines your child needs and when
- what your child's triggers are and how to avoid them
- how to manage a flare-up
- when to get emergency medical care
Following the plan can help your child do normal everyday activities without having asthma symptoms.
Keeping an asthma diary is another way to help manage asthma. Tracking your child's symptoms and medicines will help you know when your child is more likely to have a flare-up.
By using these tools, giving medicines as prescribed, and avoiding triggers, you'll help keep your child healthy and breathing well.
- When to Go to the ER if Your Child Has Asthma
- How to Handle Asthma Flare-Ups
- Asthma Triggers
- Managing Asthma
- Asthma Center
- Do Allergies Cause Asthma?
- Dealing With Asthma Triggers
- School and Asthma
- How Do Asthma Medicines Work?
- Handling an Asthma Flare-Up
- Asthma Action Plan
- What Is Asthma?
- Asthma Center
Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
© 1995- The Nemours Foundation. KidsHealth® is a registered trademark of The Nemours Foundation. All rights reserved.
Images sourced by The Nemours Foundation and Getty Images.