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Medical note: This is general travel information, not individual medical advice. Travelers with relevant heart, lung, sleep-related breathing, blood or other medical conditions should discuss high-altitude travel with a qualified clinician.
Core rule: The most reliable way to lower the risk of acute mountain sickness is to avoid going too high too fast.
Reduce altitude-sickness risk
Ascend gradually
Give your body time to acclimatize rather than making a large jump in sleeping elevation.
Do not ascend with symptoms
If symptoms consistent with altitude illness develop, do not sleep higher until they resolve.
Descend if worsening
Worsening symptoms, confusion, loss of coordination or severe breathlessness can require descent and urgent medical evaluation.
Fitness and hydration
Being physically fit does not make a traveler immune to altitude illness. Normal hydration is sensible, but drinking excessive water is not a substitute for acclimatization.
Medication
Acetazolamide can be useful for some itineraries and risk profiles. Medication decisions should be discussed with a clinician rather than treated as an affiliate recommendation.
General hiking gear
These products are travel gear only; they are not presented as prevention or treatment for altitude sickness.
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Medical reference: CDC Yellow Book — High-Altitude Travel and Altitude Illness.