What is altitude sickness?

Altitude sickness is the term for medical conditions that can happen when you move to a higher altitude too quickly. The higher up you go, the thinner the atmosphere gets. That means breathing in the same amount of air gets you less oxygen than at a lower altitude. Altitude sickness happens when your body has trouble adjusting to the difference in how much oxygen you’re getting with each breath.

What are the symptoms of altitude sickness?

Altitude sickness can cause many symptoms, and these can vary depending on the severity. The symptoms of acute mountain sickness usually appear within the first day or so of reaching a high altitude. More severe forms like HAPE or HACE take longer to appear, usually between two and five days.

Symptoms include:

• Headache (this is the most common symptom).
• Nausea and vomiting.
• Loss of appetite.
• Fatigue, even when resting.
• Malaise (a noticeable “unwell” feeling).
• Trouble sleeping.
• Dizziness or lightheadedness.
• Vision changes (while rare, these usually indicate more severe altitude sickness, and are due to blood vessel ruptures in your retinas).

How can I prepare for altitude changes?

Prioritize acclimatization and arrive early to allow enough time for you to adjust before your first practice round. 

Stay Hydrated and Avoid Alcohol

• High altitudes can lead to dehydration due to increased respiratory water loss. 
• Drink plenty of fluids, aiming for 3–4 liters per day.
• Avoid alcohol and caffeine for at least the first 48 hours at high altitude, as they can exacerbate dehydration and impair acclimatization. ​

Limit Physical Exertion Initially

• Engaging in strenuous activity too soon can increase the risk of altitude sickness. 
• Rest for the first 24 hours after arriving at high altitude.
• Gradually increase activity levels as your body acclimates. ​

More information on Altitude Sickness from the Cleveland Clinic