Why does spicy food make my nose run?

BBC Earth (Asia) - - Science -

Spicy com­pounds are pro­duced by plants to de­ter an­i­mals from eat­ing them. They have evolved to be as ir­ri­tat­ing as pos­si­ble to the mu­cous mem­branes of mam­mals. In fact, the cap­saicin in chilli doesn’t ac­tu­ally cause tis­sue dam­age, but it trig­gers the nerve re­cep­tors that nor­mally de­tect heat, and your nose is fooled into pro­duc­ing ex­tra mu­cus to pro­tect your si­nuses. LV

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