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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.
1 Infected Tooth-Sometimes, a tooth abscess or an infected tooth may also cause pain behind ear. 2  An infected tooth causes swelling of the lymphatic glands. 3  Such swollen glands can cause the pain behind the ear.