World Lung Day 2026: How to self-check your lung health and know when to see a doctor

On World Lung Day 2026, doctors explain how to self-check your lung health, from breathing and stair tests to pulse oximeters, peak flow and spirometry.

We tend to think about our lungs only when breathing becomes difficult. But lung problems do not always begin with dramatic breathlessness. Sometimes, you are suddenly struggling with a flight of stairs that never bothered you before, getting tired during a routine walk or dealing with a cough that simply refuses to disappear.

This World Lung Day, observed on September 25, the focus is on “A Lifetime of Lung Health”, highlighting the importance of protecting and maintaining respiratory health at every stage of life. But how do you know whether your lungs are doing okay?

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There is no reliable way to completely assess lung health at home. However, doctors say there are several signs you can watch for, along with a few simple checks that can tell you when it may be time to get your lungs properly evaluated.

“Your lungs can sometimes show signs of trouble before a major breathing problem develops, so paying attention to changes in your breathing and exercise tolerance is important,” says Dr Harish Verma, Director, Pulmonology, ShardaCare - Healthcity.

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Start with the way you breathe

The first lung-health check involves paying attention to your everyday breathing. Persistent breathlessness, wheezing, frequent coughing, chest tightness or unusual fatigue during routine activities are symptoms Dr Harish says should not be ignored.

A cough that lasts for more than a few weeks is another warning sign. It becomes particularly important to get it checked if the cough is recurrent or accompanied by phlegm, blood, fever or unexplained weight loss.

Dr Sapna Yadav, Senior Consultant - Pulmonology & Sleep Medicine, Sarvodaya Hospital, Greater Noida West, similarly advises people to watch for a persistent cough lasting more than three weeks, particularly if it produces mucus or comes with wheezing or chest tightness.

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“These may indicate underlying issues like asthma, bronchitis, or COPD,” she says.

Has climbing the stairs suddenly become harder?

Your exercise tolerance can tell you quite a bit about changes in your respiratory health. Think about activities that were previously easy for you. Can you still walk briskly without stopping? Can you climb the same number of stairs? Can you exercise for the same amount of time without becoming unusually breathless?

“If activities that were previously comfortable, such as walking briskly, climbing stairs or exercising, suddenly leave you unusually breathless, it may indicate reduced respiratory fitness or an underlying lung or heart problem,” says Dr Harish.

However, he points out that exercise tolerance can be affected by many factors and should not be considered a diagnostic test on its own.

Dr Sapna suggests the stair-climbing test as a simple observation people can make at home. If climbing one or two flights of stairs leaves you excessively breathless, she says, it is worth investigating further.

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Try the “talk test”

Another simple check Dr Sapna suggests is the talk test. If you cannot speak in full sentences without gasping for air, your lungs may be under strain, she says.

This can be particularly useful as an observation during mild exertion. If an activity that normally allows you to talk comfortably suddenly leaves you struggling to complete a sentence, that change is worth noticing.

How long can you comfortably hold your breath?

Dr Sapna also suggests another simple self-check: timing how long you can comfortably hold a deep breath. According to her, healthy lungs typically allow a person to hold their breath for around 25–30 seconds.

What does a pulse oximeter tell you?

A pulse oximeter can be useful if you have one at home. The small device clipped onto your fingertip measures blood oxygen saturation, or SpO2.

Dr Sapna says readings below 95% warrant attention. Dr Harish, however, stresses that oxygen-saturation readings need to be interpreted carefully. A normal reading does not necessarily mean your lungs are completely healthy.

Several factors can affect a pulse-oximeter reading, including cold fingers, poor circulation, movement or an inaccurate device.

Persistently abnormal readings, particularly when accompanied by significant breathlessness, should prompt medical assessment rather than repeated home monitoring alone, says Dr Harish.

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Peak flow can help people with asthma

If you have asthma, another useful device may already be part of your routine. A peak-flow meter measures how forcefully you can breathe air out of your lungs. Dr Sapna says peak-flow meters are often used by people with asthma to measure how forcefully they can exhale.

Dr Harish adds that peak-flow monitoring can be useful in some people with asthma to track changes in airflow. Unlike a general home “lung test”, peak-flow monitoring is more useful for following changes over time, particularly when it has been recommended as part of asthma management.

The test that actually checks lung function

Home observations can tell you that something may need investigating. They cannot tell you exactly what is wrong. That is where medical testing comes in.

Spirometry is one of the most commonly used tests for assessing lung function. It measures how much air you can breathe out and how quickly you can do it.

“Doctors may recommend tests depending on symptoms and risk factors,” says Dr Harish. “Spirometry is one of the most commonly used tests and measures how much air you can breathe out and how quickly, helping identify conditions such as asthma and chronic obstructive pulmonary disease (COPD).”

Depending on your symptoms and medical history, a doctor may also recommend a chest X-ray, CT scan, allergy testing, blood tests or other investigations. The test you need depends on what your doctor is trying to investigate.

Who should pay particular attention to their lung health?

World Lung Day's message of maintaining lung health throughout life is particularly relevant to people who have known respiratory risk factors.

Dr Harish says people with a history of smoking, occupational exposure to dust or chemicals, recurrent respiratory infections, asthma or significant air-pollution exposure may require particular attention.

For these people, persistent respiratory symptoms should not simply be dismissed as ageing, lack of fitness or something they have “always had”.

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A change in your usual breathing pattern is worth discussing with a doctor, particularly when you already have factors that can affect lung health.

When should you stop self-checking and see a doctor?

The most important thing to remember about all these checks is that they are meant to recognise warning signs, not diagnose lung disease.

“If breathing symptoms are persistent, worsening or interfering with daily activities, consult a pulmonologist for an appropriate evaluation rather than relying solely on home tests,” says Dr Harish.

Dr Sapna says people should seek medical attention if breathing difficulties are accompanied by bluish lips or fingertips, chronic fatigue or unexplained weight loss. A persistent cough, wheezing, breathlessness or a noticeable decline in your ability to exercise should similarly not be ignored.

Your lungs deserve attention before there is a crisis

World Lung Day is not only about people who already have a lung condition. Its 2026 theme, “A Lifetime of Lung Health,” is about maintaining respiratory health throughout life.

And that starts with something surprisingly simple- knowing what is normal for you.

Pay attention to how you breathe while walking. Notice whether stairs have suddenly become harder. Watch for a cough that lingers. If you use a pulse oximeter, understand what the number can and cannot tell you. If you have asthma and use a peak-flow meter, keep track of changes as advised by your doctor.

And when something does not feel right, do not keep testing yourself indefinitely. A home check can tell you that it is time to ask questions. Spirometry and other clinical investigations can help doctors find the answers.