Through what mechanism does heart disease cause a tight jaw? are palpitations a sign that a jaw discomfort is heart related?

Palpitations: These are caused by many things. Stress, excitement, irritants both physical and chemical, pressure like a hiatal hernia or esophageal push or pull, and primary heart things, the causes are very many in number. Jaw discomfort relates to interpretation of signals on a common nerve pathway and not necessarily to the heart specifically