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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.
Sinus infection can cause clogged ears, ear pain and temporary hearing loss. A sinus infection can cause clogged ears, ear pain and temporary hearing loss. A sinus infection is when your nasal cavities become swollen or inflamed, either due to an infection or as an allergic reaction. Ear pressure is a common symptom related to sinus infections.