Aching pain in my upper jaw, only one side, could it be wisdom tooth?

Maybe: If you have one. May also be a cavity on any of the teeth in that quadrant, can also be sinusitis. See your local dentist for an exam.

Possible: Possible. Could be other tooth in area. See dentist for exam. If wisdom tooth, see oral surgeon. For best results with wisdom teeth, make sure you are evaluated and treated by a board certified oral & maxillofacial surgeon.