Breathlessness — Causes and When to See a Doctor
Also described as shortness of breath, difficulty breathing, dyspnoea.
Breathlessness that comes on suddenly, occurs at rest, or wakes you at night needs urgent assessment. Gradual breathlessness over weeks — getting winded on stairs you used to manage — usually points to the lungs or the heart, and both are investigated together at Iswarya Hospital, OMR Chennai.
🚨 Get emergency care if you have
- •Sudden breathlessness at rest, or that stops you completing a sentence
- •Blue tinge to the lips or fingertips
- •Chest pain alongside the breathlessness
- •Waking at night gasping for air, or needing extra pillows to sleep
- •Breathlessness with a swollen, painful calf
What causes breathlessness?
Asthma
Wheezing and chest tightness, often worse at night, in cold air or during exercise.
COPD
Progressive breathlessness with a chronic cough, usually with a smoking history.
Heart failure
Breathlessness on lying flat, with leg swelling and fatigue.
Anaemia
Reduced oxygen-carrying capacity, causing breathlessness on exertion with tiredness and pallor.
Chest infection or pneumonia
Breathlessness with fever, cough and coloured sputum.
How it is investigated
- ✓Pulse oximetry and chest X-ray
- ✓Spirometry (lung function testing)
- ✓ECG and 2D echocardiogram, to separate cardiac from respiratory causes
- ✓Blood counts and thyroid function
Not every patient needs every test. The consultation decides which of these apply to you.
Frequently asked questions
Is breathlessness a lung problem or a heart problem?▼
It can be either, and the two are often investigated together because the symptoms overlap. Breathlessness that worsens when you lie flat, with ankle swelling, leans cardiac. Breathlessness with wheeze, cough or sputum leans respiratory. Spirometry and an echocardiogram usually settle the question.
When is breathlessness an emergency?▼
When it starts suddenly, occurs at rest, prevents you finishing a sentence, or comes with chest pain or blue lips. Go to an emergency department rather than waiting for an appointment.
This page is general health information, not a diagnosis or a substitute for a consultation. Symptoms overlap between harmless and serious conditions, and only an examination can tell them apart. If you are worried, see a doctor.
Plan your first visit
Not sure which specialist to see? Tell our care team the reason for your visit and we will help you choose.
- Bring previous prescriptions, relevant test reports or scan images, a medication list and photo ID.
- If you plan to use insurance, bring your policy details. OPD, tests and admission benefits depend on your individual plan and approval.
- Your first consultation determines which tests or treatments are needed; not everyone needs every test listed on this page.
Appointments are requests until confirmed. In a medical emergency, call 044 2025 2025 or go to the nearest emergency department.