what is an asthma

Asthma is a common long-term (chronic) lung condition that inflames, swells, and narrows the airways (breathing tubes) that carry air in and out of your lungs.¹²

What Happens Inside the Airways

• Inflammation: The lining of the airways becomes swollen and irritated.
• Bronchospasm: The muscles surrounding the airways tighten, making the passage much tighter.
• Excess Mucus: The airways can produce extra sticky mucus, further blocking airflow.¹²³

These changes make breathing difficult and can feel like trying to breathe through a very thin straw.¹

Common Symptoms

• Wheezing (a whistling sound when breathing)
• Shortness of breath
• A tight chest
• Coughing (especially at night or early in the morning)¹²³⁴

Symptoms can vary from mild to severe, come and go, and flare up into a dangerous asthma attack if triggered.¹²

Common Triggers

Asthma symptoms can be set off by:

• Allergens (pollen, dust mites, mold, animal dander)
• Exercise or physical exertion
• Cold air or changes in weather
• Air pollution, smoke, or strong chemical fumes
• Viral infections like colds or the flu¹²³⁴⁵

Diagnosis and Treatment

• Diagnosis: Doctors typically use breathing tests such as spirometry or peak flow monitoring, alongside a review of symptoms and medical history.¹²
• Management: While there is no cure, asthma is generally well-managed using inhalers. These include reliever inhalers (fast-acting bronchodilators to open airways during symptoms) and preventer inhalers (daily steroid medications to keep inflammation down).¹²³

You can learn more about daily management strategies on the NHS Asthma Guide or explore support resources from Asthma + Lung UK.

Asthma is a common, long-term lung condition that causes the airways to become inflamed and narrowed, making it harder to breathe . While there is currently no cure, most people manage their symptoms well with daily care and inhalers.¹²

How It Affects the Airways

When you encounter an asthma trigger, three main changes happen inside your breathing tubes:¹²

• Inflammation and swelling. The lining of your airways becomes swollen and sensitive, leaving less room for air to pass through.
• Muscle tightening. The thin bands of muscle wrapped around your airways tighten and squeeze, narrowing the tubes further.
• Excess mucus. Your body produces extra sticky mucus or phlegm, which can clog the already narrowed airways.¹²

Common Symptoms

Symptoms often come and go, and they are frequently worse at night or early in the morning.¹²

• Wheezing. A high-pitched whistling sound when you breathe, especially when breathing out.
• Shortness of breath. Feeling breathless or like you cannot get enough air into your lungs.
• Chest tightness. A feeling of pressure or a heavy band squeezing around your chest.
• Coughing. A persistent cough that often flares up at night, during exercise, or when laughing.¹²³⁴⁵

When symptoms suddenly get much worse, it is called an asthma attack or flare-up. Severe asthma attacks can be life-threatening and require urgent medical help.¹²

Common Triggers

Everyone with asthma has their own unique set of triggers that irritate their airways.¹

• Allergens. Substances like pollen, dust mites, mould, and pet dander often spark symptoms.
• Irritants. Cigarette smoke, high air pollution, chemical fumes, and strong scents can cause flare-ups.
• Illnesses. Viral respiratory infections, such as colds and the flu, are very common triggers.
• Physical and weather factors. Strenuous exercise, cold air, and sudden changes in weather can tighten the airways.¹²³⁴⁵⁶

Diagnosis and Treatment

According to the NHS, a GP or asthma nurse typically diagnoses the condition using breathing tests like spirometry or a handheld peak flow meter. Treatment focuses on keeping airways open and calm through two main types of medicine, usually delivered via an inhaler:¹²³

• Preventer inhalers. Taken every day, these contain low-dose steroids that reduce underlying airway swelling so you are less likely to react to triggers.
• Reliever inhalers. Used only when symptoms appear, these act quickly to relax tight airway muscles and make breathing easier.
• Combination therapy. Some people use a single inhaler (such as MART therapy) that combines both preventer and reliever medicines.¹²³⁴

You can find practical guides on inhaler techniques and managing flare-ups through Asthma + Lung UK.¹²

Would you like to explore a specific area of asthma, such as how to recognise an asthma attack, common asthma medications, or how breathing tests work?

Asthma is a long-term condition that affects your lungs and makes it difficult to breathe.

It happens when the airways (the tubes that carry air in and out of your lungs) become inflamed, swollen and sometimes narrower than normal.

What happens when someone has asthma?

When a person has asthma:

• The airways become swollen.
• The muscles around the airways tighten.
• Extra mucus may build up.
• Less air can move in and out of the lungs.

Common symptoms of asthma

1. Wheezing – a whistling sound when breathing.
2. Coughing – especially at night or early in the morning.
3. Shortness of breath – feeling like you cannot get enough air.
4. Chest tightness – feeling pressure or squeezing in your chest.

What can trigger asthma?

• Dust and dust mites.
• Pollen.
• Cold air.
• Exercise.
• Smoke and air pollution.
• Pets (such as cats and dogs).
• Respiratory infections, such as colds.

Can asthma be treated?

Yes! Although asthma usually cannot be cured, it can be controlled with treatment.

Common treatments include:

• Reliever inhalers: Help open the airways quickly when symptoms occur.
• Preventer inhalers: Reduce swelling and inflammation in the airways over time.

(Important) If someone with asthma is struggling to breathe, cannot speak in full sentences, or their reliever inhaler is not helping, they need emergency medical help. In the UK, call 999.

In simple words: Asthma is a condition that makes the breathing tubes in your lungs swollen and narrow, making it harder to breathe.