Why do my ears pop on an aeroplane or when a train enters a tunnel?

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Offline paulat

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When a train on which I was travelling recently (yes, it was moving, and on time, and I could afford a ticket (that's what's called a miracle!)) entered a tunnel my ears "popped" like they do on aeroplanes. Why does this happen?
 

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Offline Karen W.

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I would think the air pressure change in the tunnel effects the pressure inside your ear, but I am no expert and can't tell you why..perhaps at a guess it causes more pressure inside or something and your ears might pop to release the pressure buildup.. who knows I am just hazarding a guess..

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