Diagnostics·Diagnostics
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Asthma is a condition that affects the airways in your lungs, making them narrow and swollen, which can cause coughing, wheezing, and shortness of breath. Diagnostic tests help measure how well your lungs are working and whether asthma is likely. The results give your doctor clues about the type and severity of your asthma, and guide treatment.
Key facts
Asthma is very common – it affects millions of people worldwide, of all ages.
It can start at any age, but often begins in childhood. It is slightly more common in boys before puberty and in women after puberty. Family history, allergies, and certain environmental factors increase the risk.
Your doctor will diagnose asthma by taking your medical history, listening to your symptoms, and doing breathing tests. The main test is spirometry – you breathe into a machine that measures how much air you can blow out and how fast. Another test is peak flow monitoring – you use a handheld device at home to check your breathing over time. Sometimes a test that uses methacholine (a substance that narrows airways) is done if asthma is suspected but spirometry is normal. The results are compared to normal values for people your age, height, sex, and ethnicity. A large improvement in lung function after using a quick-relief inhaler (or a large drop in response to a trigger) points toward asthma.
Asthma treatment focuses on controlling inflammation and preventing symptoms. Most people use two types of inhalers: a preventer (used daily to reduce airway swelling) and a reliever (used only when symptoms happen). Your doctor will prescribe the right inhalers based on your test results and symptom frequency. Treatment is stepwise – if symptoms are not controlled, your doctor may increase the dose or add another medicine.
Living with asthma means monitoring your symptoms, taking your medicines consistently, and avoiding triggers. Use your peak flow meter regularly as your doctor advises. Have an asthma action plan written by your doctor that tells you what to do when your peak flow drops or when you feel worse. Keep your reliever inhaler with you. Many people with asthma live full, active lives – including top athletes.
Asthma itself cannot always be prevented, especially if you have a strong family history. However, you can reduce the chance of asthma attacks by avoiding triggers, taking your preventer medicine as prescribed, and monitoring your peak flow regularly. Early diagnosis and treatment help prevent long-term lung damage.
Getting the flu vaccine every year and the pneumonia vaccine (if recommended) can prevent respiratory infections that often trigger asthma attacks. Talk to your doctor about which vaccines are right for you.
There is no routine screening for asthma in the general population. However, if you have chronic cough, wheeze, or breathlessness, or if you have strong risk factors (like allergies or family history), ask your doctor for a breathing test. Early detection leads to better control.
With modern treatment, most people with asthma can control their symptoms and live a normal, active life. The key is understanding your test results, following your action plan, and working closely with your healthcare team. Asthma is a long-term condition, but it does not have to limit your quality of life. Many people find that with good management, they rarely have symptoms.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 16, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
Your doctor or nurse will explain each test before you do it. Spirometry takes about 15 minutes. Peak flow monitoring you do at home – you'll get a diary to record your numbers. The pattern of your peak flow readings over days or weeks helps confirm asthma or rule it out. You will be told what your personal 'best' peak flow number is, and what action to take if it drops (for example, using your reliever inhaler or seeking help).
Inhalers are the mainstay of asthma treatment. Preventer inhalers usually contain a low-dose corticosteroid to reduce inflammation. Reliever inhalers are short-acting bronchodilators that quickly open the airways. Some people also use combination inhalers (preventer plus a long-acting bronchodilator) if needed. Your doctor may also recommend add-on treatments such as leukotriene receptor antagonists (tablets), theophylline (tablets), or biologic injections for severe asthma that does not respond to standard treatment. Always take medicines as prescribed and discuss any changes with your healthcare team.
Surgery is not a treatment for asthma itself. However, some people with severe asthma may benefit from a procedure called bronchial thermoplasty (where heat is applied to the airway lining to reduce muscle thickness). This is only available in specialist centres and is used when other treatments have not worked.
A healthy, balanced diet rich in fruits, vegetables, and whole grains supports your immune system. There is no specific 'asthma diet', but some studies suggest that eating plenty of vitamin C, vitamin D, and omega-3 fatty acids may help. Exercise is encouraged – choose activities that suit you, like swimming, walking, or cycling. If cold air bothers you, wear a scarf over your mouth and nose. Always check with your doctor if you are unsure about starting a new exercise program.
Living with a long-term condition like asthma can cause anxiety, especially during flare-ups. Some people feel stressed about having an attack or feel limited by their condition. It is important to talk about these feelings with your doctor or a mental health professional. Taking control of your asthma through a good action plan and understanding your test results can reduce worry.