I'm guessing things like antihistamines suppress the production of this mucus? What would happen if this process was turned off completely? Is this mucus produced in response to something physically in the nose that it's trying to flush out? I could understand allergens and such as those are physical particles but what about when you have a cold/flu? What's actually being flushed out? I just got over a flu where I was blowing out tremendous amounts of liquid so I'd love to know what my nose thought it was flushing out, aside from what it was producing itself.