Asthma is a long term condition that affects the airways of the lungs. It can make breathing difficult because the airways may become inflamed, swollen, narrowed, and filled with excess mucus.

Asthma symptoms can vary from person to person. Some people experience occasional symptoms, while others may have frequent breathing problems. With the right diagnosis, treatment, and self care, most people with asthma can live active and fulfilling lives.

What Is Asthma?

Asthma is a chronic respiratory condition in which the airways become unusually sensitive and reactive.

When a person with asthma encounters a trigger, the muscles surrounding the airways may tighten. At the same time, the airway lining can become swollen and produce additional mucus. These changes reduce the space available for air to move through the lungs.

This can result in wheezing, coughing, shortness of breath, and chest tightness.

The degree of airway narrowing can change over time. This is one of the important characteristics that distinguishes asthma from many other respiratory conditions.

How Does Asthma Affect the Airways?

To understand asthma, imagine the airways as small tubes carrying air into and out of the lungs.

In a healthy airway, air can move freely.

During an asthma episode, several changes can occur at the same time.

Airway inflammation causes the inner lining of the airway to become swollen.

Bronchoconstriction causes the muscles surrounding the airway to tighten.

Excess mucus production can further obstruct the passage through which air travels.

The combined effect is narrowing of the airways, which makes breathing more difficult.

Common Symptoms of Asthma

Asthma does not produce exactly the same symptoms in everyone. Symptoms can also change in frequency and intensity.

Common symptoms include:

Wheezing, which is a whistling sound that may occur during breathing.

Shortness of breath, particularly during physical activity or an asthma flare.

Chest tightness, which can feel like pressure or heaviness in the chest.

Coughing, especially at night, early in the morning, or after exercise.

Difficulty exercising because of breathing problems.

Some people experience mainly a persistent or recurrent cough. This pattern is sometimes referred to as cough variant asthma.

What Causes Asthma?

There is no single cause of asthma.

The condition usually develops through a combination of genetic susceptibility and environmental influences.

A person may be more likely to develop asthma if they have a family history of asthma or allergic diseases.

Environmental exposure can also contribute to the development or worsening of asthma.

Possible contributing factors include air pollution, tobacco smoke, occupational dust and chemicals, allergens, respiratory infections, and other environmental exposures.

Common Asthma Triggers

A trigger is something that can provoke or worsen asthma symptoms in a susceptible person.

Allergens

Common allergic triggers include pollen, house dust mites, mold, cockroach particles, and animal allergens.

Smoke and Air Pollution

Cigarette smoke, secondhand smoke, traffic pollution, and other airborne irritants can aggravate sensitive airways.

Exercise

Physical activity can trigger airway narrowing in some people. This is known as exercise induced bronchoconstriction.

Importantly, people with asthma should not automatically avoid exercise. With appropriate management, many people with asthma can participate in sports and other physical activities.

Cold or Dry Air

Breathing cold or dry air can provoke symptoms in some individuals.

Respiratory Infections

Viral respiratory infections are common triggers of asthma worsening, particularly in children.

Certain Medicines

Some people with asthma can develop symptoms after taking aspirin or other nonsteroidal anti inflammatory drugs.

Certain beta blockers can also worsen asthma in susceptible individuals.

Medication related asthma symptoms should always be discussed with a healthcare professional.

What Happens During an Asthma Attack?

An asthma attack, also called an asthma exacerbation, occurs when symptoms become significantly worse than usual.

The airways may become more inflamed and narrow more severely.

A person may experience increasing:

Cough

Wheezing

Chest tightness

Shortness of breath

The person may also need their prescribed reliever medication more frequently.

A severe asthma attack can become life threatening because severely narrowed airways may prevent adequate airflow.

Emergency Warning Signs

Severe breathing difficulty requires urgent medical attention.

Emergency warning signs can include:

Severe difficulty breathing

Inability to speak normally because of breathlessness

Blue or gray lips or face

Confusion or unusual drowsiness

Extreme exhaustion

Rapidly worsening symptoms

Little or no improvement after prescribed rescue treatment

If someone is experiencing severe breathing difficulty, they should receive emergency medical care immediately.

How Is Asthma Diagnosed?

Asthma is diagnosed using a combination of medical history, physical examination, and objective testing when appropriate.

A doctor may ask about the pattern of symptoms, possible triggers, allergies, previous attacks, family history, occupational exposure, smoking exposure, and response to medication.

The important feature is often the variation in symptoms and airflow over time.

Spirometry

Spirometry is one of the most important tests used when evaluating asthma.

During spirometry, a person breathes forcefully into a device called a spirometer.

The test measures several aspects of lung function, including:

FEV1, which represents the amount of air exhaled during the first second of a forced breath.

FVC, which represents the total amount of air forcefully exhaled.

The FEV1 to FVC ratio can help identify airflow obstruction.

A doctor may perform spirometry before and after giving a bronchodilator. Improvement in airflow after the medication can support an asthma diagnosis.

Other Tests Used in Asthma Assessment

Peak Expiratory Flow

A peak flow meter measures how quickly a person can force air out of the lungs.

Some people with asthma use peak flow measurements to monitor changes in their breathing over time.

Bronchial Challenge Testing

If asthma is suspected but routine testing does not clearly demonstrate it, specialized testing may sometimes be performed.

A controlled challenge may assess how sensitive the airways are to a particular stimulus.

FeNO Testing

Fractional exhaled nitric oxide, commonly called FeNO, measures nitric oxide in exhaled air.

An elevated FeNO level can provide evidence of certain types of airway inflammation, although it cannot diagnose asthma by itself.

Allergy Testing

Skin testing or blood testing can help identify allergic sensitization.

Finding an allergy does not necessarily prove that it is responsible for a person’s asthma symptoms, so the results need to be interpreted together with the clinical history.

Conditions That Can Resemble Asthma

Several other conditions can cause cough, wheezing, or breathing difficulty.

These can include:

Chronic obstructive pulmonary disease

Vocal cord or inducible laryngeal obstruction

Heart failure

Bronchiectasis

Gastroesophageal reflux

Certain respiratory infections

Anxiety or panic related breathing symptoms

Foreign body aspiration, particularly in young children

Because these conditions can resemble asthma, proper evaluation is important.

Asthma Treatment

The main goals of asthma treatment are to control symptoms, maintain normal activity, prevent severe exacerbations, and reduce the risk of long term complications.

Treatment varies according to age, symptom pattern, severity, risk factors, lung function, and response to previous treatment.

Inhaled Corticosteroids

Inhaled corticosteroids, often abbreviated as ICS, are among the most important anti inflammatory treatments used in asthma.

Examples include budesonide, beclometasone, fluticasone, and mometasone.

These medicines reduce inflammation inside the airways and can lower the risk of asthma exacerbations.

They are different from the anabolic steroids sometimes associated with bodybuilding.

Possible local side effects include oral thrush and hoarseness.

Good inhaler technique and appropriate mouth rinsing after use can reduce these problems.

Bronchodilators

Bronchodilators relax the muscles surrounding the airways and help improve airflow.

Short Acting Beta 2 Agonists

Medicines such as salbutamol, also known as albuterol in some countries, can provide rapid relief from bronchoconstriction.

However, frequent reliance on a short acting reliever can indicate poor asthma control and should prompt a review of the person’s treatment.

Long Acting Beta 2 Agonists

LABAs provide longer lasting bronchodilation.

Examples include formoterol and salmeterol.

For asthma, LABAs are generally used together with an inhaled corticosteroid rather than as standalone treatment.

ICS and Formoterol

Some modern asthma treatment strategies use a combination of inhaled corticosteroid and formoterol.

Depending on the prescribed regimen, this combination can provide both anti inflammatory treatment and rapid bronchodilation.

Some treatment plans allow the same inhaler to be used for maintenance and symptom relief. This approach is often called MART or SMART, depending on the terminology and specific regimen.

The correct regimen should be determined by a healthcare professional.

Leukotriene Receptor Antagonists

Montelukast is an example of a leukotriene receptor antagonist.

It may be useful for selected patients, including some people who have asthma together with allergic rhinitis.

Montelukast has also been associated with possible neuropsychiatric adverse effects, so its benefits and potential risks should be discussed with a healthcare professional.

Long Acting Muscarinic Antagonists

Medicines such as tiotropium may be added to treatment for selected people whose asthma remains inadequately controlled.

These medications work through a different pathway to help relax the airways.

Biologic Treatments

Some people have severe asthma that remains uncontrolled despite optimized conventional treatment.

For selected patients, specialist doctors may consider biologic medications.

Depending on the patient’s asthma characteristics, biologic therapy may target pathways involving:

IgE

Interleukin 5

Interleukin 5 receptors

Interleukin 4 and interleukin 13 signaling

TSLP

Examples include omalizumab, mepolizumab, benralizumab, dupilumab, and tezepelumab.

These treatments are generally reserved for appropriately selected patients with severe asthma.

Oral Corticosteroids

Medicines such as prednisolone or prednisone can be used for significant asthma exacerbations.

They can be highly effective, but repeated or prolonged use can cause important side effects.

Potential complications include:

Weight gain

High blood pressure

High blood sugar

Osteoporosis

Cataracts

Increased susceptibility to infections

Adrenal suppression

For this reason, long term systemic corticosteroid exposure is generally minimized whenever effective alternatives are available.

Why Inhaler Technique Matters

Using an inhaler incorrectly can mean that much less medicine reaches the lungs.

Proper technique depends on the type of inhaler.

In general, patients may need to:

Prepare the device correctly

Exhale before inhaling

Create a proper seal around the mouthpiece

Use the appropriate inhalation speed

Hold their breath afterward when instructed

A spacer device can improve medication delivery with certain inhalers and may make inhaler use easier for some people.

Healthcare professionals should periodically check inhaler technique.

Asthma Control and Asthma Severity

These two terms are related but do not mean the same thing.

Asthma control describes how well the condition is controlled at a particular time.

Doctors may consider:

Daytime symptoms

Night waking

Reliever use

Activity limitation

Recent exacerbations

Lung function

Asthma severity relates more broadly to the level of treatment required to maintain control.

A person can have few symptoms because their treatment is working effectively. Therefore, having minimal symptoms does not necessarily mean that the underlying asthma is inherently mild.

Asthma and Exercise

People with asthma can often exercise safely.

Physical activity has many health benefits and should not automatically be avoided because of asthma.

Some people experience exercise induced bronchoconstriction, particularly during or after intense activity.

A healthcare professional can help determine an appropriate treatment strategy.

With proper management, many people with asthma participate successfully in activities ranging from recreational exercise to competitive sports.

Asthma in Children

Asthma is common during childhood.

Children may experience:

Recurrent wheezing

Night time coughing

Cough during exercise

Breathing difficulty during viral infections

Reduced ability to keep up with other children during physical activity

Diagnosing asthma in very young children can sometimes be difficult because they may not be able to perform reliable lung function tests.

Repeated wheezing does not automatically mean that a child has asthma. Other childhood respiratory conditions can produce similar symptoms.

Asthma During Pregnancy

Asthma can also occur during pregnancy.

Maintaining good asthma control is important because poorly controlled asthma can create risks for both the pregnant person and the developing baby.

People who are pregnant should not stop asthma medication on their own.

Instead, asthma treatment should be reviewed with an appropriate healthcare professional so that both disease control and medication safety can be considered.

Asthma and Respiratory Infections

Respiratory infections are common triggers of asthma exacerbations.

A viral infection can increase airway inflammation and make the airways more sensitive.

This can lead to:

Increased coughing

More wheezing

Greater shortness of breath

Increased need for reliever treatment

People with asthma should follow their personalized asthma action plan when an infection causes their symptoms to worsen.

Lifestyle Measures That Can Help

Medication is an important part of asthma management, but everyday habits and environmental measures can also help.

Avoid Tobacco Smoke

Smoking and secondhand smoke can worsen asthma and interfere with good disease control.

Avoiding exposure is an important part of asthma management.

Identify Personal Triggers

Keeping track of when symptoms occur can help identify possible triggers.

For example, symptoms may repeatedly occur after exposure to dust, pollen, pets, smoke, exercise, cold air, or workplace chemicals.

Maintain Physical Activity

Regular physical activity can support overall health.

Asthma should generally be managed so that the person can remain physically active rather than using asthma as a reason to avoid activity.

Maintain a Healthy Weight

For people who are overweight or obese, appropriate weight management may improve asthma control.

Follow Recommended Vaccination Advice

Respiratory infections can trigger asthma exacerbations. Following locally recommended vaccination guidance can help reduce the risk of certain preventable infections.

Asthma Action Plan

People with persistent asthma can benefit from a written asthma action plan.

An action plan may explain:

Which medicines should be taken regularly

How and when to use a reliever

How to recognize worsening asthma

What to do when symptoms increase

When to contact a healthcare professional

When to seek emergency medical attention

Some action plans use a green, yellow, and red zone system to help patients recognize different levels of asthma control.

Can Asthma Be Cured?

There is currently no universal cure for asthma.

However, asthma can often be controlled very effectively.

Some people experience long periods with few or no symptoms. Children may also experience periods of remission, although symptoms can return later.

The aim of modern asthma management is not simply to make symptoms disappear temporarily.

The goal is to achieve good long term control, prevent exacerbations, preserve lung function, maintain normal activity, and minimize treatment side effects.

Can Asthma Be Life Threatening?

Yes.

Although many people have well controlled asthma, a severe asthma exacerbation can become life threatening.

Severe airway narrowing can interfere with the movement of air into and out of the lungs.

This is why worsening symptoms should never be ignored, particularly when prescribed rescue treatment is not providing adequate relief.

Severe breathing difficulty, inability to speak normally, bluish or gray discoloration, confusion, extreme exhaustion, or rapidly worsening symptoms require urgent emergency medical attention.

Detailed infographic illustrating asthma pathophysiology, triggers, symptoms, diagnosis, and treatment, designed for patient education and medical learning. © amamedico

Frequently Asked Questions About Asthma

Is asthma contagious?

No. Asthma is not contagious.

You cannot catch asthma from another person.

Can people with asthma exercise?

Yes.

Most people with asthma can exercise when their condition is appropriately managed.

Is asthma only an allergic disease?

No.

Allergic asthma is common, but asthma can occur without a clear allergic trigger.

Does asthma go away?

Some people experience long periods without symptoms, particularly during childhood. However, asthma can return, so ongoing assessment may still be necessary.

Can asthma damage the lungs?

Poorly controlled asthma can contribute to persistent airway changes and reduced lung function in some people. Effective treatment and good control can reduce the risk associated with uncontrolled disease.

Is wheezing always asthma?