Why does my jaw tire easily while chewing food? and my ears feel plugged when it happens. is it serious?

Best to be: Evaluated by a dentist for a comprehensive exam and x-ray series to rule out any dental problems, and then go from there. Causes can be malocclusion, inadequate dentition, worn down dentition to name a few. There can also be TMJ issues. Would recommend an eval first. Good luck and hope this helps. Thanks for the question.

See below: It could be a condition called jaw claudication which could be a symptom of temporal arteritis, a potentially serious condition. You should see your doctor.