Why would a guinea pig die over night?

Like most rodents guinea pigs can be scared easily and have excitable hearts, my first thought would be heart attack. There's also the possiblity he/she was sick and it went unnoticed as they have no way to tell you how they feel. My Guinea pig died extremely quickly from what looked like Diahorea, i would check to see if the Guinea had, had diahorea. It also could have died from Draughts or a heart attack My guinea pig died from pneumonia. The only way I knew he was sick, was he didn't drink or eat as much as he normally did. He sneezed once, and was unusually calm for a day or two. By the time he showed sick symptoms and I took him to the vet, it was too late. The vet said they don't like to worry you with their problems, so they like to pretend they're not sick until they can't fake it anymore. Heart attack seems very logical, too.

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Guinea Pigs are prey animals and as such don't show when they are sick. It is a defense mechanism, because of this, most piggy owners don't know their pig is sick until it is an emergency situation. You should always do routine check-ups on your piggy. Some things to check are, Lumps, Dried mucus around the nose or a runny nose, and for parasites. If your piggy is suddenly less active, or isn't eating/drinking properly you should take her to the vet asap!