This may sound weird but...

[Synthos]

My left nostril doesn't allow the same airflow as my right nostril... no matter whether I blow my nose or not. Should I see the doctor about it?

 

[48Highlander]

just pull your goddamn finger out of the left nostril!

NEXT!

 

[Synthos]

oh man.. THANK YOU!

 

[Conquistador]

Sniff some horseraddish, see if that helps.

 

[old medic]

http://en.wikipedia.org/wiki/Nostril

In humans it is quite normal for just one nostril to be functioning at any one time. During the course of a day they will switch over approximately every four hours or so.

http://www.utmb.edu/otoref/Grnds/Turbinate-2003-0312/Turbinate-2003-0312.htm

The turbinate and other nasal mucosa may also undergo cyclic side-to-side engorgement referred to as the nasal cycle.  The nasal cycle lasts from two to six hours, but does not normally affect the total nasal resistance since one side is relatively decongested.  Recent studies suggest, however, that the nasal cycle may occur consistently in only 20-30% of the population (11).

http://www.entnet.org/healthinfo/sinus/deviated-septum.cfm?renderforprint=1

Estimates are that 80 percent of all nasal septums are off-center, a condition that is generally not noticed. A "deviated septum" occurs when the septum is severely shifted away from the midline. The most common symptom from a badly deviated or crooked septum is difficulty breathing through the nose. The symptoms are usually worse on one side