Thanks for posting your query,
Pain at the back of ear suggest, some kind Dental disorders are the most common cause of referred pain
to the ear. Recent dental work, infection in the tooth, an impacted tooth
, an abscess and ill-fitting dentures can all cause ear pain.
The temporomandibular joint is near the ear, and degenerative disease and arthritis of the jaw can lead to earache.
Diseases of the neck like degenerative disease of the cervical spine
can result in earache.
Tonsillitis, ulcers in the tongue and sore throat
are other causes of earache.
With complaints of earache, you should get prompt medical advice
and treatment of the underlying cause.
I hope this information has been both informative and helpful