Asthma

Asthma means your airways are always a bit touchy and occasionally dramatic.

By Greg Goodwin · Published November 4, 2026

Cheat Sheet

Prevalence: about 27.8 million people in the US (8.4%) had current asthma in 2023, per the CDC's National Health Interview Survey.
Sex gap: 11.0% of adult women had current asthma in 2023 versus 6.8% of adult men.
Race and ethnicity: 11.5% of Black non-Hispanic people, 8.6% of White non-Hispanic people, and 7.0% of Hispanic people had current asthma in 2023.
Income gap: 11.7% of people below the poverty threshold had current asthma versus 6.9% of those at 450% of the threshold or higher.
Age pattern: the highest rate was ages 20 to 24 at 10.9%; the lowest was ages 0 to 4 at 3.0%.
Attacks: 42.3% of people with current asthma had an asthma attack in 2023, including 47.1% of children with asthma.

The 60-Second Version

Asthma is a long-term lung condition in which the airways, the paths that carry air to your lungs, are prone to swelling and narrowing. The CDC puts it plainly: if you have asthma, you have it all the time, but you have attacks only when something bothers your lungs. During an attack the sides of the airways swell and shrink, mucus clogs them, and less air moves in and out, which brings coughing, wheezing, chest tightness, and trouble breathing. It is one of the most common long-term diseases of children, but adults have it too. Doctors work it out through questions about symptoms and family history plus a breathing test called spirometry, and care typically combines medicines with steering clear of triggers. This page is general information, not medical advice, and a clinician can sort out what is going on in a particular person.

The Long Version

What Happens in the Airways

The CDC describes the airways as branching paths, like the limbs of a tree, that get smaller as air moves toward the lungs. In an asthma attack the sides of those airways swell and the passages shrink, and the mucus the body makes clogs them further. Less air gets in and out. The classic symptoms are wheezing, breathlessness, chest tightness, and coughing at night or early in the morning. The key idea is that the condition itself is constant, while the attacks are episodic and arrive when something bothers the lungs. That is also why someone can look perfectly fine at a party and still have asthma.

Who Has It

The CDC's most recent national tables use 2023 National Health Interview Survey data. They estimate that 27,807,000 people in the United States, or 8.4%, had current asthma, defined as having been told by a health professional that they had asthma and still having it. That included 4,804,000 children under 18 (6.7%) and 23,004,000 adults (8.9%). Among adults, women were affected more often than men, at 11.0% versus 6.8%, while among children boys led, at 7.6% versus 5.7% for girls. By age group the highest rate, 10.9%, was among people 20 to 24, and the lowest, 3.0%, was among those 0 to 4.

An Uneven Burden

Asthma does not fall evenly across the population. In the same 2023 survey, 11.5% of Black non-Hispanic people had current asthma, compared with 8.6% of White non-Hispanic people and 7.0% of Hispanic people. Income showed a gradient too: 11.7% of people below the poverty threshold had current asthma, falling to 6.9% among those at 450% of the threshold or higher. These are survey estimates with margins of error, and they describe patterns rather than explain causes. The CDC does offer a home visitor checklist aimed at finding common triggers, including dust mites and mold and moisture, because removing triggers along with proper medical care can improve health.

Getting a Diagnosis

The CDC notes that asthma can be hard to identify, especially in children under age 5, and that a doctor can help find out. A clinician may ask whether you cough a lot, particularly at night, whether breathing problems are worse after physical activity or at certain times of year, and about chest tightness, wheezing, and colds that last more than 10 days. Family history of asthma, allergies, or other breathing problems matters, as do questions about missed school or work. A breathing test called spirometry measures how much air you breathe out after a very deep breath, before and after you use asthma medicine, to show how well the lungs are working.

Control, Attacks, and Medicines

Per the CDC, asthma can be controlled by knowing the warning signs of an attack, staying away from triggers, and following a doctor's advice. Not everyone with asthma takes the same medicine. Some medicines are breathed in and others are taken as pills, and they can be used as reliever therapy or controller therapy, with controller medicines helping a person have fewer and milder attacks. Attacks remain common: in 2023, 42.3% of people with current asthma had one, including 47.1% of children with asthma. The CDC advises seeing a doctor if you need your reliever medicine more and more, since a different medicine may be needed.

Why People Care

Asthma is common enough that nearly everyone knows someone with it, and knowing the basics helps you take a coughing, wheezing friend seriously. It also affects school, work, and sports. Anyone with possible symptoms should see a clinician. This is general information, not medical advice.

Glossary

Airways: The paths that carry air to your lungs, which branch and get smaller like a tree.
Asthma attack: An episode in which the airways swell and shrink and mucus clogs them, causing coughing, chest tightness, wheezing, and trouble breathing.
Trigger: Something that bothers the lungs and can set off an asthma attack.
Spirometry: A breathing test that measures how much air you breathe out after a very deep breath, before and after asthma medicine.
Controller therapy: Asthma medicine used to help a person have fewer and milder attacks, as opposed to reliever therapy.

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