The Strange Reason You Should Hum While You Breathe, From A Breathing Expert 

We're just beginning to uncover the link between respiratory health and immune health, but the connection so far has been nothing short of astounding. Consider your breathing habits another lifestyle factor you can control when it comes to immunity (similar to the foods we eat, the supplements we take, and the way we move), only it's as available as, well, air. 

Nestor is a fan of nasal breathing (for a host of reasons, which you can learn more about here). But one of the main points is because the sinuses can release a boost of nitric oxide—a molecule that influences immune function. "It's an amazing molecule that interacts with pathogens," Nestor says. "It interacts directly with viruses." 

In fact, researchers have been testing nitric oxide's effects on mammalian cells infected with coronavirus; Nestor has previously discussed one clinical trial in particular, which is currently studying nitric oxide as a therapy to help restore lung function and boost an immune response in patients with severe symptoms of COVID-19. 

Needless to say, nitric oxide is an impressive molecule. The best part? It's naturally available to you as you breathe through your nose. And, according to Nestor, it's enhanced even more as you hum. 

"If we hum, we increase nitric oxide 15-fold1," he says. One study even showed that by humming for around an hour, four times per day, participants were able to eliminate chronic rhinosinusitis symptoms (i.e., congestion, facial pressure, and nasal inflammation) in just four days. In other words, we have a pretty powerful mechanism to enhance nasal function and support those immune-boosting molecules—all it takes is humming your favorite tune.