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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 lymph nodes behind the ears are swollen this is a sign that you are suffering from an infection in the ear, throat or eye, and around the scalp. You may also be suffering from an allergic reaction in this area that has heightened your antibody production.