UNLV football player Ben Christman's cause of death has been revealed ... with officials stating the 21-year-old passed away naturally.
The Clark County Office of the Coroner/Medical Examiner shared the results with TMZ Sports on Thursday ... which determined he died from cardiac arrhythmia and cardiomyopathy.
Cardiac arrhythmia is an irregular heartbeat -- either too fast or too slow -- and cardiomyopathy is a disease that impacts the heart muscle.
As we previously reported, Christman experienced chest pains during practice the day before his tragic death.