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Sudden & Undiagnosed Illness

Last reviewed: October 2026

Sudden deaths are often caused by heart problems people didn't know they had: about half of cardiac arrests happen to people with no known heart condition. Regular checkups can catch silent risks early.

Warning Signs

  • Unexplained fainting
  • Rapid or irregular heartbeat
  • Chest pain or shortness of breath

Prevention Tips

  • Regular checkups, including blood pressure, blood sugar and cholesterol
  • Don't ignore recurring symptoms
  • Learn CPR

Where to get checked or find care for sudden & undiagnosed illness in your country.

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Sources

Medical disclaimer: This information is for education and community awareness only. It is not medical advice, diagnosis or treatment. Always talk to a qualified healthcare provider about your health, and call emergency services if you think someone needs urgent help.