Maipo Valley peaks in Central Chile at around 4,500-5,000 m asl, 10 years ago for me. Mild 'pressure'-like headache around the temples which kinda 'pulsated' with every strong step or stomp. Some nausea was also had. The headache gradually dissapeared first as soon as I got back lower in the valley, the nausea hanged around for much longer. About a week's worth of prior acclimatisation at 3-4,000 m. |