突然死 (totsuzan-shi) refers to sudden death, which occurs unexpectedly and often without prior warning. This phenomenon can happen to individuals of any age and is frequently linked to underlying health issues, such as heart disease or arrhythmias. The term is commonly associated with cases where individuals appear healthy but suffer fatal events, such as a heart attack or stroke. Awareness of risk factors, including lifestyle choices and family history, is essential for prevention. Regular health check-ups can help identify potential dangers before they lead to sudden death.