Temporal arteritis, internal ear infection, TMJ and tooth decay
can all be the cause of pain. In temporal arteritis there is inflammation of the blood vessel at the temple. Internal ear infection, fluid in ear (that went in during swimming or during a shower bath or due to infection), or impacted wax can be a problem. TMJ and infection of tooth, exposed nerve endings of tooth can be a problem. Infection in the eye, glaucoma, near and far sightedness and sinusitis are the other causes.