What is altitude sickness?
Altitude sickness is a negative reaction to the decreasing amount of oxygen available in your bloodstream. It has three forms: Mild Altitude Sickness which is also called Acute Mountain Sickness (AMS). Similar to the feelings of a hangover, symptoms include: headache, nausea and fatigue. If you have AMS then you should take this as warning sign that you are at risk to develop more serious forms of altitude sickness.
The next form and more advanced stage of Altitude Sickness is: High Altitude Pulmonary Edema (HAPE) which is excess fluid in the lungs. This causes extreme shortness of breath a high temperature and coughing frothy spit and blood. HAPE usually develops after 2 or 3 days at altitude above 5500m. The breathlessness will progress and soon the individual will lose the ability to breathe even at rest. Other symptoms include a high heart rate and blue lips. It is easy to confuse symptoms of HAPE with a chest infection. If you suffer from symptoms of HAPE must be suspected and the affected individual must be evacuated to a lower altitude.
The last form of the altitude sickness is High Altitude Cerebral Edema (HACE) which is a build-up of fluid in the brain. About 1% of people who ascend above 3000m get HACE. The lowest altitude at which a case of HACE has been reported was 2100m. HACE is life-threatening and requires urgent action. HACE can lead to death in only a few hours. A person with HACE will find it difficult to walk in a straight line. This is a useful test to perform on someone with severe symptoms of acute mountain sickness.
Symptoms of Altitude Sickness
The initial symptoms of altitude sickness are as follows:
Prevention of altitude sickness
Be aware that you are at increased risk of altitude sickness if you have experienced it before.