Why would two young guinea pigs die suddenly?

Well it depends on if u just got them from the pet store or if u got them from a friend.if u got them from the friend,they might have died because of too much stress. or they could have died because of this disease called scurvy. it iz caused because of lack of too much vitamin c.guinea pigs cant make their own vitamin c so there is special drops for their water that has vitamin c. and special chewable pills that tastes like crap(my dad tried 1 to see if they tasted good to my guinea pig or not)that gives ur guinea pig vitamin c. but my guinea pig hates them a lot :p. im only eleven years old but i love to answer these questions a lot. so keep asking questions!!!