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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.
The lymph nodes become enlarged as they produce more and more antibodies. Swollen lymph nodes behind the ear indicate a throat, ear, or eye infection, which your body is trying to fight. Injury: Any damage to the head or neck area can cause the lymph nodes behind the ear to swell as the body is trying to repair itself.