# Why does my nose run after I do?

**URL:** <https://boards.straightdope.com/t/why-does-my-nose-run-after-i-do/362783>\
**Category:** Factual Questions\
**Created:** [June 30, 2006, 6:52pm UTC](https://boards.straightdope.com/t/why-does-my-nose-run-after-i-do/362783 "2006-06-30T18:52:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bubble\_pop\_electric](https://avatars.discourse-cdn.com/v4/letter/b/ecae2f/32.png) [@bubble\_pop\_electric](https://boards.straightdope.com/u/bubble_pop_electric)\
**Post date:** [June 30, 2006, 6:52pm UTC](https://boards.straightdope.com/t/why-does-my-nose-run-after-i-do/362783/1 "2006-06-30T18:52:52Z")

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I run a two to three miles every day to stay in reasonable shape. For some reason, after running, my nose starts to run like crazy. I know it’s not just me—this happens to almost all of my friends that i’ve asked after rollerblading, biking, whatever. It’s not allergies, because it happens on the treadmill too. I don’t have a cold. Why does exercise seem to induce mucus drainage?

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**Author:** ![diggleblop](https://avatars.discourse-cdn.com/v4/letter/d/ac91a4/32.png) [@diggleblop](https://boards.straightdope.com/u/diggleblop)\
**Post date:** [June 30, 2006, 6:59pm UTC](https://boards.straightdope.com/t/why-does-my-nose-run-after-i-do/362783/2 "2006-06-30T18:59:46Z")

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I read somewhere one time that exercise causes heavier breathing, which stimulates the mucous membranes and causes and overload. I could be totally wrong though. In fact, I think there are different theories on this subject among Doctors.