Do Guinea pigs get sick and what sicknesses do they get?

u can tell if they act funny or if their coat is dull they get fat ( for pregnant girl piggies this is normal ) and if they are extra skinny in some cases pet stores don't care so they may be some what skinny if they don't move at all their feet swell up ( in some cases on their first days with you they may cower and not run around ) my pig did not care so cute !!! any way that is pretty much it but they may die if you have nothing for them to chew on ( there teeth never stop growing so they need to chew ) HOPE IT HELPED i heart (love ) guinea pigs !!!!!!!!!!!!!!!!!!!!!!!!!!