Demo mode.
These sample articles were written to demonstrate the plugin. They are not Mayo Clinic content and are not medical advice.
Pneumonia
What pneumonia is, who is at higher risk, and signs that need medical care.
Overview
Pneumonia is an infection that inflames the air sacs in one or both lungs. It can be caused by bacteria, viruses or fungi and ranges from mild to life-threatening.
Common symptoms
- Cough, which may bring up mucus
- Fever and chills
- Shortness of breath
- Chest pain when breathing or coughing
- Confusion in older adults
Higher risk
- Adults 65 and older and young children
- People with chronic heart or lung conditions
- People who smoke or have weakened immune systems
Prevention
Vaccines can help prevent some types of pneumonia. Ask your care team which vaccines are right for you.
When to get help
Seek care for trouble breathing, chest pain, a persistent fever, or a cough with pus.
Last reviewed: September 18, 2026