Because sound is so apparent we kind of don’t look at it as what is essentially is which is vibration and because we live outside the body we think of lungs in terms of breathe rather than the dynamic effects it has internally inside of us.
When you have inflammation there is less nitric oxide circulating around those areas. The vibrations from humming or moaning increases nitric oxide production and the exhale promotes circulating it.
https://erj.ersjournals.com/content/22/2/323#:~:text=Abstract,humming%20compared%20to%20silent%20exhalation.
EDIT: I simplified it. I really would suggest looking up Nitric Oxide in the body, in your spare time though. Oxygen gets all the love but the balance between the two is the foundation of harmony in all aspects of the body. Nitric Oxide (NO) is a shapeshifting wizard.
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