# Cardiac arrest early warning symptoms

> Live situation record from CLSTR: https://clstr.news/situations/cardiac-arrest-early-warning-symptoms
> Updated: 2026-08-14T23:10:57.000Z. Sources: 6. Developments: 2.

Medical experts and research are identifying various physiological indicators that may precede serious cardiovascular events. Initial reports highlight a range of subtle symptoms, including neck swelling, cold feet, shortness of breath, unexplained fatigue, and dizziness, which may be linked to underlying conditions like diabetes, hypertension, or thyroid disorders.

Subsequent research published in Lancet Digital Health suggests that specific symptoms of cardiac arrest can manifest up to 24 hours before the event occurs. Medical professionals note that approximately 50 percent of individuals report warning signs beforehand. These precursors often differ by gender, with sudden chest pain being a primary sign for men, while sudden difficulty breathing or shortness of breath is more common in women.

## Timeline

### 2026-08-14: Cardiac arrest symptoms can appear 24 hours in advance

Research shows that up to 50 percent of people experience warning symptoms, such as chest pain in men or shortness of breath in women, up to 24 hours before a cardiac arrest occurs.

6 sources. https://clstr.news/cluster/cardiac-arrest-symptoms-can-appear-24-hours-in-advance

### 2026-07-31: Key Warning Signs of Cardiac Arrest and Other Health Indicators

Health advice warns that thin hair, red eyes, yellow eyes, neck swelling, cold feet and fatigue can signal diabetes, hypertension, liver or thyroid issues, and may precede cardiac arrest.

2 sources. https://clstr.news/cluster/key-warning-signs-of-cardiac-arrest-and-other-health-indicators

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Cite as: Cardiac arrest early warning symptoms. CLSTR, https://clstr.news/situations/cardiac-arrest-early-warning-symptoms