According to Yahoo, once you cover your ears with headphones, you block natural air from entering into your ears, which increases the production of bacteria by 700% in 1 hour. Your eardrum naturally cannot bear influx of bacteria in that quantity so it starts to react by causing pain or hearing loss.
According to Straight Dope, the source of this claim is from a 1992 study from the medical journal, Laryngoscope, in which Itzhak Brook and William Jackson measured bacteria levels found on 20 audio headsets. At the beginning of the experiment, the typical headset had 60 microorganisms on its surface, after an hour’s use of the headphones, that number went up to 650 – 700, times more.
Source: Yahoo
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