Do You Actually Have Two Noses?

It’s basic anatomy: two eyes, two ears — and two noses? Yep, you read that right. While the nose appears to be one structure, it’s actually made up of two passageways called the nasal cavities. Although they work well together, they also work separately, essentially giving us “two noses.” Due to this organ’s integral role in the respiratory system, keeping “both” noses healthy and understanding how they function is essential.

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The Nasal Cavities

The left and right nostrils open to separate nasal cavities, which allow air to flow in and out while we breathe and transport air to the rest of the respiratory system. Because a wall separates the left and right nasal cavities (called the septum), one cavity can still function normally when the other is congested, obstructed, or inflamed. As a result of this, each side acts as an independent nose.

The Nasal Cycle

If you’ve ever noticed that you can breathe better out of one side (regardless of whether you’re congested), you are experiencing your nasal cycle at work. The autonomic nervous system controls this phenomenon and spontaneously switches the dominant nostril throughout the day by increasing or decreasing the blood flow to each side. The dominant nostril will do about 75% of the breathing during this time.

There are four types of nasal cycles: classic (congestion and decongestion alternate equally), parallel (congestion and decongestion occur in both nostrils at the same time), irregular (congestion and decongestion do not have a clear pattern), and acyclic (decongestion and congestion do not differ). Each cycle lasts around three to six hours.

Keeping “Both” Noses Healthy

Noses are more complex than they seem, and keeping both sides clean and clear is vital for nose health and the respiratory system's overall health. A nasal spray with saline solution can keep the nasal cavities clean and moist. If your nose feels extra dry, try using a humidifier.

When suffering from congestion due to allergies or illness, try medication with a nasal decongestant to reduce the swelling of the nasal cavities. If allergies are the culprit, antihistamines like Claritin and Allegra can reduce congestion. There are also medicated nasal sprays, depending on your symptoms. Corticosteroid nasal sprays help with inflammation, while ipratropium bromide spray can reduce mucus. Don’t forget to spray both nasal cavities, even if only one is congested. Chances are, in a few hours, the opposite side will be clogged due to the nasal cycle. And, of course, always consult your doctor before trying anything new.

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