Idiopathic pulmonary fibrosis explained

What happens in the lungs

Healthy lungs contain millions of tiny air sacs with thin, stretchy walls, where oxygen passes into the blood. In IPF, these walls gradually become thickened and scarred, a process called fibrosis. Scar tissue is stiff and does not stretch, so the lungs cannot expand as easily and oxygen struggles to cross into the bloodstream. Over time this makes breathing harder and reduces the oxygen the body receives. The word idiopathic means the cause is unknown; unlike some other lung-scarring conditions, IPF is not clearly due to a specific dust, medicine or disease, although smoking and age seem to increase the risk. The scarring tends to progress, but the speed varies a lot from person to person, and modern treatments can help slow it down.

Symptoms and who it affects

IPF mostly affects people over sixty and is more common in men and in those who have smoked. The two most typical symptoms are breathlessness that slowly gets worse — first on exertion such as stairs or hills, later with everyday activity — and a persistent dry cough that does not clear. Because these come on gradually, they are often put down to ageing or being unfit, so diagnosis can be delayed. Other signs include tiredness, unintended weight loss, and clubbing, where the ends of the fingers become rounded. A doctor listening to the chest may hear fine crackles, often likened to the sound of Velcro being opened. Anyone with breathlessness and a dry cough that has been getting worse over months should see their GP.

How it is diagnosed

Diagnosing IPF usually needs a specialist team, because several conditions can scar the lungs and it is important to identify the right one. After listening to the chest and asking about symptoms, work and exposures, the GP will arrange breathing tests and a chest X-ray and refer on. The key investigation is a high-resolution CT scan, which shows the pattern and distribution of scarring in detail. Breathing tests measure how much air the lungs hold and how well oxygen transfers into the blood. Blood tests help rule out other causes such as autoimmune disease. In many hospitals the results are reviewed by a multidisciplinary team of lung specialists, radiologists and pathologists, who agree the diagnosis together; occasionally a lung biopsy is needed to be sure.

Treatment and support

There is currently no cure that reverses the scarring, but a good deal can be done. Two antifibrotic medicines are available in the UK that can slow the rate at which the scarring worsens, and specialists decide who is likely to benefit. Beyond medicines, pulmonary rehabilitation — a supervised programme of exercise and education — helps people stay active and manage breathlessness. Some people need oxygen at home as the condition advances, and stopping smoking, keeping up with vaccinations, and treating other conditions such as reflux or heart problems all help. Because IPF is unpredictable, teams also talk openly about what to expect, support planning for the future, and involve palliative care to manage symptoms and maintain quality of life. Clinical trials and, for a few, lung transplant assessment may also be options.

Living with IPF

Living well with IPF means managing symptoms, staying as active as safely possible, and getting good support. Pacing activities, using breathing techniques, and keeping to a pulmonary rehabilitation programme can all reduce the impact of breathlessness. Vaccinations against flu, COVID-19 and pneumonia lower the risk of chest infections, which can set the condition back, so any new or worsening breathlessness, fever or coloured phlegm should be reported promptly. Emotional support matters too: breathlessness and uncertainty can affect mood, and specialist nurses, support groups and charities can help. Family and carers benefit from information and support as well. Regular specialist review keeps treatment up to date and ensures oxygen, symptom relief and future planning are addressed at the right time.