How do you tell if you have pneumonia?
Last updated September 3, 2026.
The pattern: cough (sometimes with yellow, green, or blood-streaked mucus), shortness of breath, high temperature, chest pain on breathing, aching body, and exhaustion beyond a cold's weight - starting suddenly or creeping over days. The separating clue: breathlessness doing normally easy things. Older adults can present quietly, with confusion as the main sign. You cannot self-confirm it - a clinician listens, checks oxygen, and often X-rays, and bacterial cases need antibiotics. Same-day care for the pattern; emergency services for severe breathlessness, blue lips, coughing blood, confusion, or faintness. Over-65s, babies, pregnant women, and anyone with heart, lung, or immune problems should ask early. Pymander is a free AI doctor, 24/7 by text, and can help you weigh symptoms.
What to do
- Weigh the breathlessness: winded on the stairs when you were fine last week is the tell.
- Same-day for the full pattern: fever plus cough plus chest pain plus exhaustion.
- Emergency for: severe breathlessness, blue lips, blood, confusion, faintness.
- Ask early if high-risk: over 65, pregnant, heart or lung disease, weak immunity.
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