I experience some sharp ear pain when i yawn or open my mouth. what could be the causes of this? probable tmj.

TMJ: you symptoms could indicated a TMJ or an eat problem. Start by seeing a dentist that treats TMJ. This could be a general dentist trained in TMJ, an oral surgeon, or a prosthodontist.

Yes: It sounds like a TMD\TMJoint issue. An evaluation to determine the cause and early intervention with appropriate treatment, if necessary, will prevent more serious problems over time.

TMJ syndrome: Temporo-mandibular syndrome is the second most frequent cause of orofacial pain after dental pain. Headache, facial numbness, popping/clicking noise in the jaw joint and jaw pain are the common symptoms. Proper diagnosis is the key to successful treatment. See Orofacial Pain practitioner for a consultation and treatment options.

Probably TMJ: Causes of TMJ syndrome are not completely understood.. Causes may include, misalignment (malocclusion) of or trauma to the teeth or jaw, teeth grinding (bruxism),, poor posture, stress or anxiety, arthritis or other inflammatory musculoskeletal disorders, excessive gum chewing. Treatment can be complex and beyond the scope of this answer. See a TMJ expert for guidance.