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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 Excess ear wax causes blockage in the inner ear leading to hearing loss and ear pain. 2  Removal of ear wax restores hearing and alleviates ear pain. 3  Infected Tooth-Sometimes, a tooth abscess or an infected tooth may also cause pain behind ear.4  An infected tooth causes swelling of the lymphatic glands.ome may be directly related to the ears while others may stem from elsewhere. Sometimes, pain originating from the ear can also cause pain in the back of head. 1  Otitis Media-Otitis media is commonly known as middle ear infection. 2  Most often, otitis media begin with an infection.