What does "natural causes" mean?

Causes such as illness or disease, as opposed to direct external forces.

What is a synonym for "natural causes"?

Common synonyms include: natural cause.

noun

noun ·Rare ·Advanced level

Noun

1
Causes such as illness or disease, as opposed to direct external forces. plural, plural-only, usually
"Some military casualties are by natural causes and accidents."

"Some military casualties are by natural causes and accidents."