What is Mountain Altitude Sickness? Mountain altitude sickness, also known as mountain sickness, is a condition that can occur when INDIVIDUALS ASCEND TO HIGH ALTITUDES TOO QUICKLY. MOUNTAIN SICKNESS DOESN’T AFFECT EVERYONE, but the likelihood of experiencing acute mountain sickness rises at higher altitudes. It is caused by the reduced oxygen levels at higher elevations, leading to symptoms such as headache, dizziness, nausea, fatigue, and difficulty sleeping. There are three main types of mountain altitude sickness: acute mountain sickness (AMS), high-altitude pulmonary edema (HAPE), and high-altitude cerebral edema (HACE). AMS is the mildest form and is the most common, while HAPE and HACE are more severe and can be life-threatening.If symptoms of mountain altitude sickness develop, it is important to descend to a lower altitude and seek medical attention if the symptoms are severe. How do I deal with Mountain Altitude Sickness/Altitude Sickness? The BEST WAY TO PREVENT ALTITUDE SICKNESS IS THROUGH ACCLIMATIZATION, allowing the body to