In the not too distant past, the medical establishment came up with SIDS (sudden infant death syndrome) as a term to describe why some infants suddenly died without an apparent cause. As society has "advanced" into the Covid era, they have modified that made-up term ever so slightly to explain away the mysterious deaths of young people while avoiding any speculation that the jabs played a key role.
-NW

Healthy young people are dying suddenly and unexpectedly from a mysterious syndrome - as doctors seek answers through a new national register.
By TOM HEATON
FOR DAILY MAIL AUSTRALIA
PUBLISHED: 02:05 EDT, 8 June 2022

[snip]

People aged under 40 are being urged to have their hearts checked because they may potentially be at risk of Sudden Adult Death Syndrome.

The syndrome, known as SADS, has been fatal for all kinds of people regardless of whether they maintain a fit and healthy lifestyle.

SADS is an 'umbrella term to describe unexpected deaths in young people', said The Royal Australian College of General Practitioners, most commonly occurring in people under 40 years of age.