What has been a problem with Caplan's categories of primary,secondary and tertiary prevention?

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One problem with Caplan's categories is that tertiary prevention, which aims to reduce complications and disability after a disease has occurred, overlaps with clinical treatment. This can lead to confusion about which interventions should be considered primary prevention (preventing disease from occurring in the first place) and which should be considered tertiary prevention (managing the consequences of a disease that has already developed).

What Has Been a Problem with Caplan's Categories of Primary,secondary