My dentist explained it pretty casually to me once. Your teeth are actually really close to your brain.
When you have a problem with your teeth or gums, whatever nerves are involved pretty much have a direct red alert hotline to your brain. Whatever infection your mouth is fighting off, it’s also coursing through your brain as well.
It’s more or less the same reason that earache or neck pains are far more aggravating than say, joint pain or stomach pain.
That said, other body aches are perfectly capable of reducing you to tears. Food poisoning for example, isn’t something you can casually push through.
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