Diagnosing Asthma

Overview

Asthma is a long-term condition that makes the small breathing tubes in your lungs extra sensitive. They can swell and narrow, making it harder to move air in and out. Diagnosing asthma means your doctor looks at your symptoms, health history, and breathing tests to see whether asthma is the likely cause. There is no single test that proves asthma, so the diagnosis is based on a pattern of symptoms and test results.

Asthma is common. It is one of the most common long-term health conditions worldwide and affects millions of children and adults.

Asthma affects people of all ages and backgrounds. It often starts in childhood, but it can also begin in adulthood. It is more likely in people with allergies, a family history of asthma or allergies, or exposure to tobacco smoke or air pollution.

Symptoms

Common symptoms

• Wheezing — a whistling sound when you breathe out.
• Coughing, especially at night, early morning, during exercise, or after laughing.
• Shortness of breath or feeling out of breath more easily than usual.
• Chest tightness or a feeling that your chest is being squeezed.
• Symptoms that come and go, or get worse with triggers such as cold air, exercise, pollen, pets, dust, or smoke.
• Waking at night because of cough or breathing problems.

Symptoms in children

• Coughing at night or during play, or a cough that keeps coming back.
• Wheezing or noisy breathing.
• Trouble feeding, sleeping, or keeping up with other children.
• Recurrent chest infections or coughs that are slow to clear.
• Pulling in around the ribs or neck when breathing hard.

Symptoms in older adults

• Breathlessness that is put down to getting older or being less fit.
• Cough or wheeze that comes and goes.
• Feeling more tired or less able to do daily activities.
• Symptoms that may be caused by other heart or lung conditions, so a careful check is important.
• Memory or movement problems that make it harder to use an inhaler correctly.

Causes

Main causes

• Asthma is caused by a mix of genes and environmental factors. The breathing tubes are more sensitive than usual and can swell and narrow when exposed to triggers.
• The exact cause is not fully understood, and it is not caused by being unfit or by emotional weakness.

Risk factors

• Having a parent or sibling with asthma, eczema, or allergies.
• Having allergies such as hay fever or eczema.
• Exposure to tobacco smoke before birth or during childhood.
• Air pollution or living near heavy traffic.
• Workplace dusts, fumes, or chemicals.
• Early childhood lung infections or premature birth.
• Being overweight or obese, which can make symptoms harder to control.

When to see a doctor

See a doctor urgently if:

• Breathing gets worse quickly, or you cannot speak in full sentences.
• Your reliever inhaler is not helping, or you need it much more often than your action plan says.
• Lips or fingertips turn blue, grey, or pale, or you feel drowsy, confused, or exhausted.
• A child is too breathless to feed, talk, or play, or is getting worse fast.
• Call your local emergency number immediately for these symptoms.

Book a routine appointment if:

• You have repeated wheezing, cough, or breathlessness.
• You cough at night, with exercise, or after contact with triggers.
• You have allergies, eczema, or a family history of asthma and want advice.
• Your symptoms are controlled but you want a review or a written action plan.
• You are unsure whether symptoms are asthma or something else.

Diagnosis

Your doctor will ask about your symptoms, when they happen, what makes them worse, and your health history. They may examine you and listen to your chest. If asthma is possible, they will usually arrange breathing tests. They may also suggest a trial of treatment and review how you respond. In children, the approach is adapted to their age.

Tests that may be done

• Spirometry — you blow hard into a tube to measure how much air you can breathe out and how fast; it may be repeated after breathing medicine that opens the airways.
• Peak flow diary — you blow into a small handheld meter morning and evening for a few weeks to show how your breathing varies.
• FeNO test — a gentle breath test that measures inflammation (swelling) in the airways.
• Allergy tests — skin prick or blood tests to look for allergies that may trigger symptoms.
• Chest X-ray or blood tests — sometimes used to rule out other causes.
• Exercise or other challenge tests — used in some cases to see whether symptoms happen with activity or specific triggers.

What to expect at your appointment

Diagnosis can take more than one visit. Keep a note of symptoms, triggers, and night waking. Bring a list of medicines and any inhalers you use. Ask questions if anything is unclear. For children, bring any school or nursery reports about breathing problems. A clear diagnosis helps you get the right plan.

Treatment

The goal is to control symptoms, prevent attacks, and help you live fully. Treatment is based on your age, symptoms, triggers, and test results. Your clinician will make a written plan and review it regularly. Good control means no night waking, no missed activities, and little need for quick-relief medicine.

Self-care at home

• Follow your written asthma action plan and keep it where you can find it.
• Learn your triggers and avoid them where practical, especially tobacco smoke.
• Check your inhaler technique with a pharmacist, nurse, or doctor.
• Keep regular review appointments, even when you feel well.
• Track symptoms or peak flow if your clinician asks you to.
• Stay active and keep up with vaccines your clinician recommends.

Medical treatments

Treatment usually involves medicines that are breathed in through an inhaler. There are reliever medicines that ease symptoms quickly and preventer medicines taken regularly to reduce swelling and keep symptoms away. Your clinician will choose what is right for you and show you how to use it. Do not start, stop, or change treatment without advice. If an inhaler is hard to use, ask about other devices or support.

When is surgery considered?

Surgery is not used to diagnose or treat asthma. Rarely, procedures may be considered for other lung problems, but this is not standard asthma care.

Living with this condition

Asthma is usually managed at home with a plan. Know what to do when symptoms start and when to get help. Keep your reliever inhaler with you, check it is in date, and make sure family, school, or work know about your plan if needed.

Lifestyle tips

• Keep your home and car smoke-free.
• Manage allergies and damp or mold where possible.
• Stay physically active with a plan that works for you.
• Get enough sleep and manage stress.
• Ask about workplace or school triggers.

Diet and exercise

No special diet is proven to treat asthma. A balanced diet and healthy weight can support general health. Regular exercise is good for most people with asthma. Warm up, cool down, and follow your plan. If exercise triggers symptoms, tell your clinician so your plan can be adjusted.

Mental health and emotional wellbeing

Asthma can cause worry, especially around attacks or diagnosis. Anxiety and low mood are common and treatable. Stress can also trigger symptoms, so talking about it is part of good care. If you feel overwhelmed or have thoughts of harming yourself, contact your local emergency number or a crisis support service right away.

Prevention

Asthma cannot always be prevented, but good care can prevent symptoms and attacks. Avoid tobacco smoke, reduce exposure to known triggers, and get symptoms checked early. If you already have asthma, regular reviews and a plan are the best prevention.

Vaccines

Keep up with vaccines your clinician recommends. People with asthma are often advised to have flu and pneumonia vaccines, but ask your local service what is right for you.

Screening programmes

There is no routine screening test for asthma. See a clinician if you have repeated cough, wheeze, or breathlessness. After diagnosis, regular reviews are used to check control.

Complications

If left untreated

• Asthma attacks that can be severe and need emergency care.
• Poor sleep, tiredness, and missed school or work.
• Limited activity and lower quality of life.
• Poorly controlled symptoms that are harder to manage over time.
• Rarely, long-term changes in the airways.

Long-term outlook

Most people with asthma can live full, active lives with a good plan, regular reviews, and support. Diagnosis is a positive step because it opens the door to the right treatment and advice. Some people need more adjustments than others, so keep talking with your clinician.

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