It may be that he choked to death after eating too much.

Because mustard is very choking, hamsters may die from overdose if they eat too much.

Because hamsters are no better than humans, their gastrointestinal tract is very fragile.

Eating too much can put a serious strain on your hamster’s stomach.

This causes hamsters to have diarrhea, which is fatal to hamsters and can easily lead to death from dehydration.