Eating raw elderberries is not recommended and if you do eat some raw elderberries it can lead to stomach aches and other stomach problems.
Other problems after eating raw elderberries include things such as diarrhea, nausea and even vomiting.
The elderberry bark, unripe berries and seeds contain small amounts substances known as lectins which cause the stomach issues.
You won't get deathly sick after eating raw elderberries but they can make your stomach hurt so it's best to cook the elderberries before eating them to avoid any stomach problems or avoid any possible sickness.
The elderberries taste much better when cooked as well.