Why do you feel breathless on exertion?

Exercise naturally makes breathing faster, but breathlessness may feel disproportionate when the lungs, heart, blood, or airways cannot meet the body’s increased demand. It can accompany asthma, COPD, bronchiectasis, anaemia, angina, or an irregular rhythm such as atrial fibrillation. Recent infection, reduced fitness, heat, and anxiety can also affect breathing. Note whether symptoms appear on stairs, walking, or at a particular pace, and whether they settle with rest.

Pause the activity, sit upright, and recover at a comfortable pace. Avoid pushing through a new symptom until it has been reviewed. Keep a simple record of the activity that triggered it, recovery time, cough or wheeze, chest discomfort, dizziness, and any ankle swelling. A clinician may check your heart and lungs, oxygen level, blood count, and breathing function. Bring a list of medicines and describe any recent change in stamina.

Call emergency services for sudden severe breathlessness, fainting, blue lips, confusion, or inability to speak normally. Treat breathlessness with chest pressure, sweating, nausea, or pain spreading to the arm, back, neck, or jaw as an emergency. Seek prompt care if symptoms are rapidly worsening, occur at rest, or follow a possible serious allergic reaction.

Ask whether your activity pattern suggests a lung, heart, or blood-related cause, which tests are suitable, and how to exercise safely while waiting. Tell the clinician if the same amount of activity now causes symptoms sooner than before.