Altitude sickness is uncommon at Front Range elevations, but mild symptoms can happen, particularly if you overdo it early. 

Common mild symptoms include:

• Headaches 
• Fatigue or sluggishness 
• Lightheadedness or dizziness 
• Shortness of breath with activity 
• Trouble sleeping 
• Sudden nausea 

These symptoms are usually temporary and improve as your body acclimates. The key is to listen to your body and give yourself time to adjust. 

I’ll never forget my own bout with altitude sickness. I felt fine, until suddenly, I didn’t. Out of nowhere, I was hit with intense nausea, shaking, and a rough night where I couldn't keep anything down. Classic altitude sickness. However by  the next morning, I felt completely normal and I’ve never experienced it again since. 

Most newcomers feel like themselves again quickly by following a few simple habits: 

1. Hydrate More Than You Think You Need. Altitude causes dehydration faster than you may expect. Start increasing your water intake before you arrive and continue daily. 
2. Take It Easy at First. Skip intense workouts, long hikes, or major home projects during your first few days. Your body needs time to adapt. 
3. Limit Alcohol and Caffeine. Both affect you more at altitude and can worsen symptoms. Moderation goes a long way during your adjustment period. 
4. Protect Your Skin and Eyes. UV exposure is stronger at elevation—even in winter. Sunscreen and sunglasses quickly become daily essentials. 
5. Add Moisture Indoors. Colorado’s dry air can cause dry skin, sinus irritation, and sore throats. A humidifier can make a big difference, especially at night.