physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
The cysts are thought to be caused by sucking the lip membranes between the teeth. Mucous cysts are harmless. Left untreated, they can form a permanent bump on the inner surface of the lip. When mucous cysts occur on the floor of the mouth, they are called ranula. When they occur on the gum, they are called epulis. Mucous cysts may form around jewelry (piercings) on the lips or tongue. A thin, fluid-filled sac appears on the inside of the lip. The sac is bluish and clear. It is painless, but it can be bothersome. The sac can also occur on the tongue, palate, inside the cheeks, floor of the mouth, or around tongue or lip piercings.