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What is serious illness in old age? Understanding major health issues

According to the National Institutes of Health, a condition that carries a high risk of mortality, negatively impacts quality of life and daily function, and is burdensome in symptoms or treatment is defined as a serious illness. This definition helps answer the question of **what is serious illness in old age?** by framing it in terms of overall impact rather than just a specific diagnosis. For older adults, serious illness often involves complex, chronic conditions that significantly impair independence and well-being.