Humming has been used for centuries in several schools of yoga and meditation, particularly those from Tibet. This phenomenon undoubtedly is linked to the increased mental clarity experienced by those who hum mantras during meditation. I suspect that humming long periods would also increase blood flow and oxygenation in the brain.
When you hum, you feel the vibration along the roof of your mouth and in your nasal cavity and sinuses. A good hum does not need to be tuneful. The most important thing is to feel the vibrating resonance through your head, and particularly in the sinus cavities. It needs to be quite loud, and at a low pitch to set up the resonance.
If you suffer from chronic sinus, throat, ear or other problems that may be related, try humming several times a day on a regular basis, and see if you notice an improvement. Ideally, hum for an hour a day, particularly before bed.
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