Your nasal membranes make mucus – aka snot – and this sticky substance serves as security against germs, dust, and pollen particles that would make breathing difficult if they reached your lungs. Moved along by tiny nostril hairs called cilia, snot pummels and pushes invading particles toward to exit – your nostrils – or dumps them down your throat. Your body produces nearly two gallons (7.6 L) of mucus each week. You usually swallow all that snot without giving it a second thought. Catch a cold virus or come under an allergy attack, however, and the membranes pump up the volume. Your nose turns into a leaky snot faucet. You start coughing up globs of phlegm – a type of mucus produced in your throat and runny nose are your body’s ways of flushing all the bad stuff.
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