Daily Mail - - Good Health -

WhY does my nose run when it’s cold out­side? ONE of our nose’s jobs is to pro­duce mu­cus to trap harm­ful sub­stances and bac­te­ria, pre­vent­ing them get­ting to the air­ways, says Sean Car­rie, a con­sul­tant ear, nose, throat spe­cial­ist and pres­i­dent of the Bri­tish Rhi­no­log­i­cal So­ci­ety.

Nasal lin­ing helps warm in­haled air to body tem­per­a­ture. ‘When it’s cold out­side and we breathe in this air, it dries the lin­ing of the nose,’ says Dr Car­rie.

‘This makes the cells pro­duce more mu­cus to main­tain the nasal cav­ity lin­ing

‘ The wa­ter vapour we breathe out mixes with cold air at the front of our nos­trils and con­denses into droplets — they pro­duce more fluid than can fit in the nasal cav­ity, caus­ing a runny nose.’

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