death from natural causes
Medical term contrasting with 外因死 (death from external causes). Used in forensic and clinical contexts.
See also: 外因死
The autopsy determined the cause of death to be from natural causes.
The distinction between death from natural causes and death from external causes is important in forensic medicine.
Compound of 内因 (internal cause) + 死 (death). The term is a modern medical coinage.