So embracing the energy of the people we saw around us, we trudged forward. Reaching Dingboche at an altitude of 4410m was another landmark. At 4410m, it was usually the point where people develop increasing symptoms of Altitude sickness (the effective oxygen drops to 12% at this altitude). Altitude sickness, or AMS, is the negative health effect of high altitude, and symptoms include headache, nausea, vomiting, and dizziness. In the worst case scenario, it can develop into High altitude pulmonary edema (HEPA) or High altitude Cerebral edema (HACE), swelling in the lungs or brain, which can result in death.
For that reason, at this altitude, we needed to be very careful in monitoring our symptoms and managing how we proceeded. Everyday, we would worry that our body would not be able to take the altitude anymore and we would be forced to descend. Regardless of how fit you are, altitude sickness affects every individual independently. But the fear of not making it to the top, after so many days of perseverance, hung heavily over both of us.
At Dingboche, there was another scheduled rest day where we go for a 3 hour climb but then descend back to Dingboche to sleep. The critical part is that we sleep at the same altitude again, allowing our bodies to better acclimatize. At this point, both of us felt some headache that would turn to a pounding headache whenever we exerted ourselves too much. For that reason, whenever we climbed any slopes, it would be at that turtle’s pace once again. As much as possible, we would help push each other uphill whenever one of us would feel the effects more heavily.