What causes chest pain when breathing?
Last updated September 3, 2026.
Pain sharpening on breathing in usually points to the chest wall or lung lining: muscle strain (after injury or exercise, eases resting), chest infection or pleurisy (with cough, coloured mucus, temperature), costochondritis (a tender press-able spot), or anxiety. The cannot-wait causes share the territory: pulmonary embolism - sudden sharp breath-pain with breathlessness, often after a long flight, immobility, surgery, or on the pill - and collapsed lung - sudden one-sided sharp pain with breathlessness. Call emergency services for chest pain with breathlessness, coughing blood, faintness, or pain with sweating and sickness. Same-day care for breath-pain with fever and coloured mucus. Pymander is a free AI doctor, 24/7 by text - but breathlessness plus chest pain is an emergency combination.
What to do
- Note what it came with: cough and fever point to infection; injury points to muscle.
- Press the spot: reproducible tenderness suggests chest wall, not heart or clot.
- Scan clot risks: recent flight, surgery, immobility, the pill, cancer.
- Breathlessness changes everything: chest pain plus shortness of breath is emergency care.
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