Acute Mountain Sickness (AMS) is a condition that can occur when people ascend to high altitudes too quickly, typically above 8,000 feet (2,400 meters). It results from reduced oxygen levels in the air, which can lead to symptoms such as headache, nausea, dizziness, and fatigue. AMS can affect anyone, regardless of age or fitness level. To prevent AMS, it is important to acclimatize gradually by ascending slowly and allowing the body time to adjust to the altitude. Staying hydrated and avoiding alcohol can also help reduce the risk. In severe cases, descending to a lower altitude is necessary for recovery.