Many things. Take him/her to the dentist.
I would believe it means your pregnant dear.
If you get punched in the jaw then that can cause sore jaws
Only if the toy touched the cold sore in some way, and then touched the other child's mouth. yes
stress on the musles, like pressure
Many reasons ! He may be doing it for attention, for a game and laugh, copying others, showing of a sore or rash. He may have a problem that needs seeking a doctors advice.
Probably yes, from what I have heard, they get sore anyway, and if you had surgery on them that could cause more pain.
Sore veins in your hand won't cause a disease.
Gout is a type of arthritis and is known to cause sore feet.
It does not cause infections/diseases/sicknessess.
Dehydration can cause a sore anything! But it may only be part of the problem.
I recommend you see an exorcist.
smoking is bad, with or without a sore throat. though, if you do have a sore throat i would recommend not smoking for a while as the chemicals and drugs in the cigarettes could make your sore throat worse. hope this helped.