How do you know if you have altitude sickness?

Altitude sickness, or acute mountain sickness (AMS), often presents symptoms like headache, nausea, dizziness, fatigue, and difficulty sleeping. These symptoms typically occur when you ascend to high altitudes too quickly, usually above 8,000 feet (2,400 meters). If you experience these signs, it’s crucial to descend to a lower altitude and seek medical attention if symptoms worsen or persist. Monitoring your body's response to altitude is key to prevention and early detection.