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Lymphadenopathy is a condition where the lymph nodes, small round organs found all over the body, begin to swell, which could cause painful lump behind ear. The swelling is caused by accumulation of immune cells within the lymph node.
Conditions such as goiter, mononucleosis and mumps may also cause neck swelling. Ear pain, on the other hand, may result from jaw arthritis, tooth infection, acute or chronic ear infection, and sinus infection, notes MedlinePlus. Sore throat and ear wax accumulation can also cause ear pain. Continue Reading.