How do I know if I'm ascending too fast?

If you develop headaches, nausea, or unusual fatigue, you're likely going too fast. Take a rest day at your current elevation. If symptoms persist or worsen after 24 hours, descend to a lower elevation.

Is Diamox safe for everyone?

No. People allergic to sulfa drugs, with kidney problems, or severe liver disease shouldn't take it. It can also interact with other medications. Always consult your doctor before taking acetazolamide.

What's the difference between mild and severe altitude sickness?

Mild AMS includes headache, nausea, and fatigue but you can still function normally. Severe AMS involves vomiting, severe headache, confusion, or difficulty breathing. Severe symptoms require immediate descent and medical attention.

Can physical fitness prevent altitude sickness?

No. Altitude sickness affects people regardless of fitness level. Being fit helps with the physical demands of trekking but doesn't prevent AMS. Even elite athletes get altitude sickness.

How to prevent altitude sickness in the Himalayas

Prevent altitude sickness in the Himalayas by ascending slowly (no more than 500m per day above 3,000m), staying hydrated, and recognizing early symptoms. Take rest days every 3-4 days of climbing and consider acetazolamide if you're prone to altitude issues.

Plan your ascent rate before you go. Never gain more than 500 meters in sleeping elevation per day once you're above 3,000 meters. Build rest days into your itinerary every 3-4 days of climbing. If trekking to Everest Base Camp, plan 12-14 days minimum from Lukla.
Arrive in Kathmandu 2-3 days early. Use this time to adjust to the time zone and get organized. Kathmandu sits at 1,400m, which gives you a gentle start to acclimatization before flying to higher elevations.
Drink 3-4 liters of water daily. Start increasing your water intake a week before departure. In the mountains, your urine should be clear to pale yellow. Avoid alcohol and limit caffeine, which can dehydrate you.
Recognize the warning signs. Headache, nausea, fatigue, and loss of appetite are early signs. If symptoms worsen or you develop confusion, difficulty breathing, or loss of coordination, descend immediately. Don't ignore symptoms hoping they'll pass.
Consider medication. Acetazolamide (Diamox) 125mg twice daily starting 1-2 days before ascent can help. Consult your doctor first. Dexamethasone is for emergencies only. Bring both if your doctor approves.
Sleep low when possible. Climb high during day hikes but return to lower elevations to sleep. This classic mountaineering principle helps your body adjust gradually while maintaining progress.

How do I know if I'm ascending too fast?: If you develop headaches, nausea, or unusual fatigue, you're likely going too fast. Take a rest day at your current elevation. If symptoms persist or worsen after 24 hours, descend to a lower elevation.
Is Diamox safe for everyone?: No. People allergic to sulfa drugs, with kidney problems, or severe liver disease shouldn't take it. It can also interact with other medications. Always consult your doctor before taking acetazolamide.
What's the difference between mild and severe altitude sickness?: Mild AMS includes headache, nausea, and fatigue but you can still function normally. Severe AMS involves vomiting, severe headache, confusion, or difficulty breathing. Severe symptoms require immediate descent and medical attention.
Can physical fitness prevent altitude sickness?: No. Altitude sickness affects people regardless of fitness level. Being fit helps with the physical demands of trekking but doesn't prevent AMS. Even elite athletes get altitude sickness.