Simple Technique to Abort Headaches Right at Onset! in General Board Posted July 19, 2019 For those interested, few research papers that discuss how pressure under axilla (armpit) changes breath flow. https://pdfs.semanticscholar.org/f47c/f0c9f3820eef41093d9815b9515cdb884eef.pdf https://www.physiology.org/doi/abs/10.1152/jappl.19220.127.116.11 https://pdfs.semanticscholar.org/971d/f7658038c42ad218da06b9887217385e4a23.pdf A more informal description of the technique - https://soranews24.com/2017/11/13/stuffy-nose-ruining-your-day-this-handy-japanese-lifehack-will-clear-your-sinuses-instantly/ I would say easier done than said in this case. Your can try it right away. Your nostril may not be blocked/runny right now, but still, on account of the normal nasal cycle (https://en.wikipedia.org/wiki/Nasal_cycle), one of the nostril will be "dominant". You can apply pressure under that armpit and notice a reversal in dominance. It happens in under a minute. The best way would be to lie down on sideways if you can, say at home. That way you don't need to apply pressure the armpit. I suggested this alternate method for situations where you cannot. There are no hard and fast rules, the point is to pay attention to the affected nostril, ensure that it stays dominant, flow of breath isn't impaired. As soon as you sense it getting blocked/runny, do it again. Personally, I do it for about a minute every 5-10 minutes, till I am certain that the ache has fully subsided, which takes anywhere from 40-50 minutes.