The Three Gases · NO Nitric Oxide
Nitric oxide is a gas your body makes in small amounts and uses as a signal. One of its best-established roles is helping blood vessels relax, which contributes to the regulation of blood flow. Oxygen delivery depends on that flow as well as on breathing.3
The inner lining of blood vessels, called the endothelium, produces nitric oxide. It signals the surrounding smooth muscle to relax, allowing a vessel to widen. This process, called vasodilation, is one of the ways the body regulates circulation.3
The nose and paranasal sinuses are another source of nitric oxide. During nasal inhalation, some of this locally produced gas travels with the air toward the lungs. Research has established the nasal origin of much of the nitric oxide measured in exhaled air and investigated its effects on lung physiology.4, 5
This is one reason nasal breathing has a meaningful role in respiratory health. It does not mean nasal breathing alone can correct a circulation disorder or treat sleep apnea. Nasal nitric oxide and nitric oxide made in blood vessels contribute in different locations; they are not interchangeable measures of whole-body health.
When your nose is clear, comfortable nasal breathing at rest allows air to follow this natural pathway. If nasal breathing feels persistently difficult, the useful next step is to understand why. Allergies, inflammation, or structural obstruction may need assessment rather than simply trying harder to breathe through your nose.10
Fatigue, congestion, or poor sleep does not establish a nitric oxide deficiency. These symptoms can have many causes. Understanding nitric oxide’s role offers context for breathing and vascular health, rather than a reason to self-diagnose or seek a product marketed to boost it.
Presentation foundation: Dr. Katherine Ahn Wallace, The Art of Breathing, Eating and Living Well.
O₂ Doctor provides education. Consult your healthcare professional for diagnosis and treatment.