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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.
Symptoms include: 1  Drainage from the ear. 2  Ear pain or discomfort. 3  Fever, may be high or suddenly increase. 4  Headache. Hearing loss.  Redness of the ear or behind the 1  ear. Swelling behind ear, may cause ear to stick  out.