You may think of your nose as a pipeline for inhaling potential infections, for instance, if someone sneezes nearby, and with your next breath airborne viruses invade your body and torment your sinuses.

But your nose is also one of your primary defenses against coming down with all the aches and pains that go along with catching a cold.

Nasal cells are able to block the rhinovirus (that's what causes a cold) as soon as you become infected, keeping it from spreading throughout your body and preventing symptoms. They do this by releasing proteins called interferons that stimulate the immune system's antiviral defenses in both infected cells and healthy ones.

It’s one more example of "The best offense is a good defense."

You can get in on the defensive by keeping your nasal passages ready to fight off infections. Avoid toxins such as first- and secondhand smoke and strong perfumes in household products that dry and irritate the nasal lining.

Keep your nasal passages moist — use a humidifier to counteract the dryness from indoor heating. Drink plenty of water (don't get thirsty), and use water-based gels to moisturize inside your nose, if needed.

Also, boost your immunity with a healthy sleep routine, frequent washing of hands, an unprocessed, plant-based diet, and at least 150 minutes a week of exercise.