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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.
What does it mean if you have pain on the left side of the head right behind and above the ear? Cervicogenic headaches are the most common cause of pain behind the ear and affect roughly 4 percent of the population, as stated by the Severe Headache Expert. They often result from degeneration of the joints in the upper neck; when they occur in younger adults, minor trauma may be the cause.