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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 Bacteria in the Mouth-An infection of the tonsils will cause the lymph nodes behind the ear to become swollen as the body removes the bacteria. 2  Sores in the mouth or gingivitis can also cause the lymph nodes to become swollen.ome specific types of infections that affect the nodes behind the left ear include: 1  Fungal Infection-Fungal infections in or around the head can cause the lymph nodes behind the ear to swell as the body works to remove the infectious elements.