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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.
If the swollen lymph nodes behind the ear last for long, then this could be a sign that you are suffering from a serious condition that will require medical care. Lymph nodes are glands that are found throughout the body, most notably in the neck, behind the ears and under the arms.