What causes swollen lymph nodes behind the ear

Many diseases can cause swollen lymph nodes behind the ear, the most common being infectious diseases such as lymphadenitis, otitis media, gingivitis, mumps and tonsillitis.
In addition, other non-infectious diseases such as lymphoma, leukaemia, nasopharyngeal carcinoma, systemic lupus erythematosus and nodular disease should also be ruled out to avoid delaying treatment.

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