What does sudden death mean?

Sudden death refers to an unexpected, natural, and abrupt death. According to the World Health Organization (WHO), death occurring within six hours of symptom onset is classified as sudden death.

While many experts define sudden death as death occurring within one hour of symptom onset, others include deaths occurring within 24 hours of symptom onset. Various cardiac conditions can lead to sudden death; however, over half of all sudden cardiac deaths are attributable to coronary artery disease (CAD). As a distinct clinical manifestation of CAD, sudden death commands significant attention from the medical community. Sudden-death-type CAD commonly occurs during the coldest months of winter. Affected individuals are often relatively young and may experience sudden onset of symptoms—such as cardiac arrest—at home, at work, or in public places, leading rapidly to death.

Approximately half of sudden death victims exhibit no prior symptoms. Whether warning signs occur shortly before death remains largely unknown. Potential precursors to sudden death may include acute chest tightness or pain, limb paralysis, or palpitations. Patients should prioritize rest and maintain regular daily routines.