Asthma

Asthma is a chronic condition that affects the airways in the lungs. The airways become inflamed, narrowed, and produce extra mucus, making breathing difficult and triggering coughing, wheezing, and shortness of breath. For some people asthma is a minor nuisance; for others it can interfere substantially with daily activities and may lead to life-threatening attacks.

Asthma cannot be cured, but its symptoms can be controlled. With the right treatment plan, most people with asthma can live fully active lives with minimal symptoms. Effective management requires identifying and avoiding triggers, using controller medicines consistently, having a written asthma action plan, and knowing how to respond to worsening symptoms.

Common signs and symptoms of asthma include:

• Shortness of breath
• Chest tightness or pain
• Wheezing when exhaling (a common sign, especially in children)
• Trouble sleeping caused by shortness of breath, coughing, or wheezing
• Coughing or wheezing attacks that are worsened by a respiratory virus

Symptoms can vary from person to person and may be worse at night or early in the morning. Some people have symptoms mainly with exercise (exercise-induced bronchoconstriction), with allergies (allergic asthma), or with occupational exposures. Severe asthma attacks can cause extreme difficulty breathing, rapid pulse, sweating, and blue lips or face—these require emergency care.

Asthma is caused by a combination of genetic susceptibility and environmental exposures. In people with asthma the airways are chronically inflamed and hyper-responsive. When exposed to triggers, the muscles around the airways tighten (bronchoconstriction), the lining swells, and mucus production increases—narrowing the airways and producing symptoms.

Common triggers include:

• Airborne allergens (pollen, dust mites, mold spores, pet dander, cockroach waste)
• Respiratory infections
• Physical activity (especially in cold, dry air)
• Cold air or sudden weather changes
• Air pollutants, smoke, and strong odors or chemical fumes
• Certain medications (aspirin, beta-blockers)
• Strong emotions or stress
• Sulfites and preservatives in some foods and beverages
• Gastroesophageal reflux disease (GERD)

Factors that increase the risk of developing asthma include:

• Family history of asthma or allergies
• Personal history of atopic conditions (eczema, allergic rhinitis, food allergies)
• Viral respiratory infections in infancy or childhood
• Exposure to tobacco smoke (including in utero and secondhand)
• Obesity
• Exposure to air pollution or occupational irritants
• Low birth weight or prematurity

Asthma can begin at any age but often starts in childhood.

Poorly controlled asthma can lead to:

• Severe asthma attacks that require emergency care or hospitalization
• Permanent narrowing of the airways (airway remodeling)
• Missed school or work and reduced quality of life
• Side effects from frequent oral corticosteroid use
• In rare cases, life-threatening respiratory failure

Good long-term control dramatically reduces these risks.

While asthma itself cannot always be prevented, attacks and poor control can be minimized by:

• Identifying and avoiding personal triggers
• Using controller (preventive) medicines every day as prescribed, even when feeling well
• Following a written asthma action plan that explains daily treatment and how to handle worsening symptoms
• Getting recommended vaccinations (influenza, COVID-19, pneumococcal when indicated)
• Maintaining a healthy weight and staying active
• Avoiding tobacco smoke and air pollution when possible
• Treating conditions that can worsen asthma (allergic rhinitis, GERD, sinusitis)

Diagnosis is based on:

• Detailed history of symptoms, triggers, and family background
• Physical examination
• Spirometry — measures how much air you can exhale and how quickly; improvement after a bronchodilator supports the diagnosis
• Peak-flow monitoring
• Allergy testing when allergic triggers are suspected
• Sometimes fractional exhaled nitric oxide (FeNO) testing or bronchial challenge tests
• Chest X-ray or other tests to rule out alternative diagnoses

In children too young for reliable spirometry, diagnosis relies more heavily on history and response to treatment.

See a doctor if you have frequent coughing or wheezing that lasts more than a few days, shortness of breath that interferes with activities, or if you suspect asthma. Seek emergency care for:

• Severe shortness of breath or wheezing
• No improvement after using a quick-relief inhaler
• Shortness of breath even with minimal activity
• Blue lips or face
• Severe anxiety due to breathing difficulty

People with known asthma should also contact their clinician if they need to use their rescue inhaler more often than usual or if symptoms wake them at night.

Asthma treatment has two main components:

Quick-relief (rescue) medicines
Short-acting beta agonists (albuterol, levalbuterol) relax airway muscles within minutes and are used for acute symptoms or before exercise.

Long-term controller medicines

• Inhaled corticosteroids — the most effective long-term control therapy for most people
• Long-acting beta agonists (always combined with an inhaled corticosteroid)
• Leukotriene modifiers
• Long-acting muscarinic antagonists
• Biologic therapies (anti-IgE, anti-IL-5, anti-IL-4/13, anti-TSLP) for severe asthma that remains uncontrolled
• Oral corticosteroids for severe exacerbations or difficult-to-control asthma (used at the lowest effective dose)

Inhaler technique training and regular review of the treatment plan are essential. An asthma action plan helps patients adjust medicines according to symptoms or peak-flow readings.

Successful asthma self-management includes:

• Taking controller medicines every day as prescribed
• Using a spacer or valved holding chamber with metered-dose inhalers for better delivery
• Monitoring symptoms and peak flow if recommended
• Knowing the early warning signs of worsening asthma and acting on the action plan
• Avoiding known triggers as much as practical
• Getting an annual flu vaccine and staying up to date with other recommended vaccines
• Keeping follow-up appointments even when asthma feels controlled

Bring the following to your visit:

• A description of symptoms, including when they occur and what seems to trigger them
• List of all medicines and inhalers currently used (bring the devices themselves if possible)
• Peak-flow readings or a symptom diary if you have one
• Notes about nighttime symptoms, exercise limitations, and missed activities or work/school
• Questions about inhaler technique, action plan, and whether a step-up or step-down in treatment is appropriate

If possible, demonstrate your inhaler technique so it can be checked and corrected.