Acute mountain sickness

Acute mountain sickness (AMS) is the cluster of symptoms that can follow ascent faster than the body adapts to lower oxygen availability. In the Mountain Madness expedition, it was not an abstract hazard: the team’s early itinerary was designed to prevent it, an abrupt change in that itinerary brought symptoms quickly, and lingering illness later made the climbers’ differing readiness a central concern as the summit bid approached.

Definition and Risks

AMS can occur when climbers gain elevation too rapidly, before their bodies have adjusted to the reduced oxygen available at altitude. The symptoms described in the book’s medical account include headache, nausea, disturbed sleep, fatigue, shortness of breath, malaise, dizziness, and loss of appetite. Its more serious and potentially deadly manifestations are high-altitude cerebral edema and high-altitude pulmonary edema. Because even moderate symptoms can affect rest and exertion, acclimatization is not simply a matter of reaching progressively higher ground; it also requires allowing the body time to recover and watching for illness that persists or worsens.

The expedition’s planned approach reflected that principle. The United States clients were originally scheduled to leave Los Angeles on March 23, spend time in Kathmandu, and fly on March 28 to Lukla, at 2,850 meters. Beginning below 3,040 meters and then walking upward slowly followed a widely recommended acclimatization maxim. The plan’s initial low-altitude arrival was intended to reduce the danger of going too high too fast.

Itinerary Change and Early Symptoms

Just before the expedition began, Scott Fischer changed the plan. Instead of taking the clients to Lukla, he announced that they would fly with expedition gear to Syangboche on March 29. The altitude jump affected the clients almost immediately. Sandy Hill Pittman reported that almost everyone was feeling the effects: even walking around left them short of breath, and two people were in bed with upset stomachs. Lene Gammelgaard was among those stricken. The experience contrasted with that of Anatoli Boukreev and Ngima Sherpa, who had flown to Syangboche four days earlier and had not found the increase from Kathmandu troublesome; the clients’ response showed how individual physiology and prior acclimatization shaped the same ascent differently.

From Syangboche, the team trekked to Namche Bazaar and stayed there for two days, resting and taking short hikes in an effort to acclimatize. Some AMS symptoms lingered. Symptoms continuing through the first day or two could be ordinary, but persistence also signaled that a climber might be having difficulty adapting. Many team members took Diamox, a sulfa-drug derivative used to help the body metabolize more oxygen and recommended as a preventive by knowledgeable high-altitude physicians. The drug’s use did not remove the need for gradual ascent: its manufacturer warned that if rapid ascent was undertaken, Diamox did not make prompt descent unnecessary when severe high-altitude illness occurred.

Symptoms During the Acclimatization Routine

At Base Camp, acute symptoms affected decisions about who could climb and how much responsibility the team could safely carry. Neal Beidleman developed a Khumbu cough soon after arrival. He coughed through the night and could not sleep; Dr. Ingrid Hunt tried steroids to reduce inflammation and bronchodilators to relax the muscles, without success. The concern was not only his discomfort. Beidleman was expected to help guide clients toward the summit, and the expedition already had one fewer guide than initially planned. If he did not recover, it was uncertain whether Fischer, Boukreev, and the climbing Sherpas could absorb the additional burden.

The acclimatization schedule was deliberately staged. The first excursion was to 6,100 meters, the planned site of Camp I, but the clients would return to Base Camp the same day rather than spend the night there. They carried only personal belongings and equipment to conserve strength; the Sherpas, working under Lopsang Jangbu Sherpa, carried rope and supplies. Afterward, the team planned to rest, recover, and assess the climbers’ condition. A later excursion would again reach Camp I, overnight there, and continue to 6,500 meters for training near the planned Camp II before descending for a multiday rest. The point was both to expose the body gradually to altitude and to preserve enough strength for the eventual summit effort.

During the third excursion, everyone except Sandy Hill Pittman and Tim Madsen left early to cross the Khumbu Icefall. Pittman stayed behind to work in her communications tent. Madsen, suffering acute AMS symptoms, had descended the previous day to Pheriche with expedition doctor Ingrid Hunt, who was also having difficulties. Their problems were attributed in part to the fact that neither had previously been at high altitude. The episode made plain that the timetable could not guarantee equal adjustment: the same expedition routine produced different outcomes, and a climber’s place in the schedule could be interrupted by the body’s response.

Readiness, Rest, and the Summit Push

Later observations continued to distinguish physical acclimatization from merely gaining altitude. Pulse-oximeter tests performed by Hunt showed Boukreev and Fischer in the low 90s, while Hunt scored in the mid-70s and a client of particular concern scored in the 60s, which she considered low even for that altitude. Boukreev, who had scientific training, questioned the value of the readings and preferred judging clients by their external appearance. Whatever the measure, he and Hunt shared concern that some clients could be at high risk if they attempted the summit.

Boukreev emphasized that acclimatization also had to preserve an energy reserve. In his view, the clients were losing strength as they climbed, and even a long rest at Base Camp could not fully compensate for that loss. He thought many were treating acclimatization chiefly as the process of reaching higher elevations, while neglecting rest and recovery. The distinction mattered as the team’s members became scattered across the mountain: some were in Pheriche recovering from AMS symptoms, while others were higher up. The spread in location was manageable, but the widening difference in readiness—and Fischer’s repeatedly interrupted routine—worried Boukreev.

On the morning of May 5, Fox and Madsen had returned after resting, and both looked reasonably well, but Boukreev remained extremely concerned about their acclimatization. He believed that their actual condition would become apparent only higher on the mountain. He was also concerned that Fischer had been unwell, had taken antibiotics, and had spent energy photographing on Pumori during a rest period. These observations did not establish that any one climber would fail; they show how illness, exertion, and interrupted recovery complicated judgments about preparedness just before the final push.

The symptoms also appeared in an episode at Camp IV during the storm. Klev Schoening, cramped into a tent with Lene Gammelgaard, Boukreev, and Martin Adams, began shouting for everyone to move over, although the others were already squeezed into half the tent and he occupied the other half with the packs. Adams thought Schoening might be experiencing AMS. The others did not take the behavior personally; they understood it as a possible effect of altitude rather than a change in his character. The moment gives the condition a different scale from the expedition’s medical plans: in the crowded tent, altitude could affect behavior and social judgment as well as breathing, appetite, and sleep.

Consequences for Safety and Interpretation

AMS shaped the expedition’s safety problem through accumulated pressures rather than one isolated diagnosis. The initial high-altitude jump brought widespread shortness of breath and stomach complaints; later, symptoms led Madsen and Hunt to descend, Beidleman’s persistent cough raised concern about the guide team’s capacity, and Boukreev doubted that several clients had adequately acclimatized. These distinct cases made readiness uneven just as the planned summit attempt approached.

The narrative also sets medical caution against the pressures of expedition logistics. The original gradual itinerary was altered; climbers’ bodies then supplied evidence of the cost, while the team continued to work through acclimatization excursions, rest periods, equipment demands, and preparations for a summit attempt. AMS therefore functions not merely as a list of symptoms but as a measure of how much the plan depended on bodies adjusting on time. In the book’s account, that adjustment remained uncertain: symptoms could linger, apparent strength could be misleading, and the decisive test of readiness might come only at greater altitude.