How to Prevent Altitude Sickness: 7 Key Tips from Aconcagua’s Medical Experts
At Mons Actividades de Montaña, we know that ascending major peaks requires much more than physical strength; it demands a smart strategy and profound care for your body. Based on the expertise of Dr. Javier Seufferheld, a physician at Aconcagua Provincial Park, we share these essential tips to prevent altitude sickness and ensure you experience your expedition safely and to the fullest.
1. Progressive Ascent and Acclimatization
Respecting your body's timing is fundamental. The medical recommendation is to gain no more than 350 to 500 meters (1,150–1,640 ft) of elevation per day, taking at least one rest day for every two days of ascent. An excellent strategy we apply is "climb high, sleep low": ascend to acclimate, trigger a cellular adaptation response, and then descend to sleep. Furthermore, the base camp zone (between 4,000 and 5,000 meters) is the most critical stage, as this is where the body achieves true deep acclimatization before facing the brutal toll of high-altitude camps.
2. Hydration as the Top Priority
Upon reaching a new altitude, your only initial task should be relative rest focused on hydrating with plenty of warm fluids. A useful mountain rule of thumb suggests drinking 1 liter of water for every 1,000 meters (3,280 ft) of ascent. Staying well-hydrated keeps your blood less viscous, drastically reducing stress on the cardiovascular system and preventing serious conditions like pulmonary edema.
3. Antioxidant Nutrition
At high altitudes, the food you consume must be nutritionally dense, prioritizing vitamins, minerals, and antioxidants. The latter play a vital role: they compensate for the oxidative damage caused by free radicals, protecting the mitochondria—the "power plants" of your cells—which are directly affected by the lack of oxygen in extreme environments.
4. Relative Rest vs. Activity
When arriving at a higher camp, the first day should be dedicated to relative rest, focusing entirely on assimilating the change and hydrating. However, from the second day onward, it is much better to engage in light physical activity—such as a short trek around base camp—to stimulate the adaptation process, rather than remaining inactive inside the tent.
5. Pay Attention to Symptoms (Red Lights)
Never underestimate the messages your body sends. Experiencing a mild headache or fleeting nausea can be a normal sign that the body is adapting to new atmospheric pressure. However, if symptoms persist or intensify, the golden rule is relentless: never continue the ascent. To keep gaining altitude, you must be completely symptom-free.
6. Preventive Use of Medication
The use of Acetazolamide (commonly known as Diamox) is not "cheating." The medical service considers it a perfectly valid safety measure to prevent Acute Mountain Sickness (AMS) and cerebral edema. If you and your personal physician decide to use it, treatment should begin 24 to 48 hours before exposure to high altitude (above 2,500 meters). Additionally, it is crucial not to stop the medication abruptly mid-expedition, as this can cause a dangerous rebound effect.
7. The Cold Factor
Protecting yourself from the cold is indispensable for proper acclimatization. Cold acts as a potent vasoconstrictor, narrowing blood vessels and hindering blood flow. When combined with hypoxia (lack of oxygen), the cold drastically impairs oxygen delivery to your tissues, slowing down adaptation and increasing the risk of severe pathologies and frostbite.
The Key to Your Next Summit
Ascending high mountains is an extraordinary challenge that requires an honest connection with your body’s needs. Proper hydration, dense nutrition, cold protection, and respecting acclimatization times will ensure you not only push your limits but also return home safe and sound. Prepare consciously and come live your next expedition with total safety alongside the Mons team!