Breathless climbing stairs: causes, red flags and when to get it checked

Climbing stairs demands more oxygen than resting. To deliver it, the lungs, heart, blood and muscles all must work together. A limitation in any link causes breathlessness. Fitness is the commonest reason, but anaemia, lung disease and heart disease are important and treatable causes.

• Reduced fitness and weight gain, with improvement as activity builds.

• Asthma and exercise-induced bronchoconstriction, with wheeze, cough or chest tightness.

• Anaemia, particularly iron deficiency, with tiredness, pallor and palpitations.

• COPD in smokers or ex-smokers, with a long-standing cough and phlegm.

• Heart failure, angina and heart valve disease, with ankle swelling, chest tightness or palpitations.

• Atrial fibrillation or other rhythm problems.

• Thyroid disease, obesity hypoventilation and anxiety.

• Interstitial lung disease, pulmonary hypertension, blood clots in the lungs and lung cancer, which are less common.

Progressive breathlessness over weeks, breathlessness at rest, chest pain, fainting, coughing blood, swollen ankles, weight loss, a persistent cough, clubbing of the fingers or a recent long journey or surgery should prompt urgent assessment.

• Call 999: sudden severe breathlessness, chest pain, collapse, blue lips or coughing blood.

• Same-day GP: breathlessness that has worsened over days, with leg swelling or a swollen calf.

• GP within a week or two: gradually worsening breathlessness over weeks, with cough or weight loss.

• Routine GP: mild breathlessness that is stable and linked to being unfit.

Doctors ask how far you can walk compared with before, how quickly it developed, cough, wheeze, chest pain, palpitations, ankle swelling, smoking, occupation, medicines and family history. They check pulse, blood pressure, oxygen saturation, the heart and lungs, and for anaemia, clubbing and ankle swelling.

• Full blood count and ferritin: for anaemia and iron deficiency.

• ECG and NT-proBNP: for heart rhythm and heart failure.

• Chest X-ray: for lung and heart size abnormalities.

• Spirometry and peak flow: for asthma and COPD.

• Echocardiogram, CT chest or cardiopulmonary exercise testing: if the cause is not yet clear.

Build activity gradually, stop smoking, manage weight and pace yourself on stairs. If you have been prescribed an inhaler, use it correctly. Treat iron deficiency only after confirming it. Keep a diary of how far you can walk and what limits you.

The NHS route is a GP and then heart or chest clinics. Private cardiology and respiratory assessment, including cardiopulmonary exercise testing, can be booked directly.