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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.
Other Causes. A cold and sore throat will cause lymph nodes behind ear or the neck as well as at the base of your skull to swell. If you get an allergic reaction to anything including drugs, chances are that lymph nodes behind ear might swell alongside other symptoms.ancer. Some types of cancer cause the lymph nodes to swell. This is mostly a sign of blood cancers and lymphoma that cause malignant cells to flow through the whole body. Once the swelling is trapped behind the ears, a growth or tumor might develop there, putting your body on high alert.