I am still trying to figure out why I don't have any acclimatization problems while going up to the summit of Mt Whitney, but nearly always get a nasty headache or two on the way down. I had three separate headaches this year on the way back to the portal in a 5 hour period. They seemed to get better if I used "puff breathing", but came back. Last year I felt fine on the summit, but felt nausea and a light headache while heading back on the switchbacks.
Any ideas?
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