: My allergy-caused stuffy nose goes away when I exercise. Why? I'm currently dealing with my seasonal pollen allergies, and currently the right side of my nose is simultaneously blocked and runny. But when I start exercising,

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Apparently exercise causes your nasal membranes to constrict helping you breathe easier. After you exercise the effects wear off and the symptoms return.

Membranes in the nose have an abundant supply of arteries, veins, and
capillaries, which have the ability to expand and constrict. Normally
these blood vessels are in a half-constricted or half-open state. But
when a person exercises vigorously, hormone (adrenaline) levels
increase. Adrenaline causes constriction of the nasal membranes so
that the air passages open up and the person breathes freely.

The opposite takes place when an allergic attack or a cold develops.
During a cold, blood vessels expand, membranes become congested, and
the nose becomes stuffy, or blocked.

In addition to allergies and infections, certain circumstances can
cause nasal blood vessels to expand, leading to vasomotor rhinitis.

fitnessandwellnessnews.com, also make a valid argument. However, there's pertains less to the situation.

Exercise can temporarily relieve nasal congestion. The increase in
circulation clears sinus pressure and allows for easier breathing. An
aerobic workout is especially successful in clearing congestion with
its cardio focus. Although you may want to blend in with the bedding,
movement provides the best relief. A stuffed nose is worse when lying
down. Sinuses don’t have gravity working with them to drain cavities
blocked by mucus. Sinus congestion is also loosened by increased
temperature in the body’s core. A runny nose may ensue, which,
although annoying, relieves sinus pressure and stuffiness.