Altitude is the distance above sea level. As you go to higher altitudes, the air contains less oxygen.
Altitude sickness happens when you're at a height with less oxygen than you're used to. For many people this happens above 8,000 feet (2400 meters). Some people can go to much higher altitudes without getting symptoms.
The higher you go and the quicker you get there, the more likely you are to get altitude sickness
Most people just get headache, tiredness, an upset stomach, and trouble sleeping
Some people get a dangerous swelling of their brain or fluid buildup in their lungs
You treat altitude sickness by going down to a lower altitude
You can prevent altitude sickness by taking your time going up in altitude
Certain medicines also can help prevent altitude sickness
There are 3 types of altitude sickness:
Acute mountain sickness: The mildest type of altitude sickness, with symptoms that usually last 1 or 2 days
High-altitude cerebral edema (HACE): An uncommon and sometimes fatal medical emergency that causes brain swelling
High-altitude pulmonary edema (HAPE): A severe and sometimes fatal medical emergency that causes breathing problems and fluid to fill your lungs
Altitude sickness is caused by traveling to a high altitude where the air you breathe contains less oxygen. You have a greater chance of having symptoms if you travel to a higher altitude too quickly or if you sleep at a high altitude.
You're at increased risk for altitude sickness if:
Medical problems such as asthma, COPD, and heart disease are NOT risk factors for altitude sickness. However, if you have a serious medical disorder, low oxygen levels at a high altitude can be dangerous.
Symptoms depend on what type of altitude sickness you have.
With acute mountain sickness, within 6 to 10 hours of traveling to over 8,000 feet you may have:
Sometimes people mistake these symptoms for a hangover, migraine Migraines A migraine isn't just a bad headache. A migraine is a particular kind of bad headache. The pain can be on one or both sides of your head. You may feel sick to your stomach, throw up, and be... read more , extreme tiredness, or a viral infection.
HACE causes brain swelling that can cause:
If not treated quickly, HACE can cause seizures, coma, and death.
HAPE may happen 24 to 96 hours after you travel quickly to a high altitude. Symptoms are worse at night when you lie down and may become more severe very quickly. HAPE causes lung problems such as:
If not treated quickly, HAPE can be fatal.
People who live at high altitudes may get HAPE when they return home after a brief stay at a lower altitude (this is called re-entry pulmonary edema).
Even if you don't have one of these types of altitude sickness, you may have symptoms from being at a high altitude such as:
Retinal hemorrhages may sometimes cause a small blind spot in your vision, but the blind spot usually goes away after you travel to a lower altitude.
Treatment depends on your symptoms and what type of altitude sickness you have. The best first step in treatment for all types of altitude sickness is:
For mild symptoms, doctors will have you:
For severe acute mountain sickness, doctors will:
If symptoms are severe, and if traveling to a lower altitude isn't possible, doctors sometimes have you breathe pure oxygen while lying in a special high-pressure bag (hyperbaric oxygen therapy).
The best way to prevent altitude sickness is to travel to higher altitudes slowly so your body has time to adjust. The altitude at which you sleep has the greatest effect on you.
Being physically fit doesn't protect you from getting altitude sickness.
Most people easily adjust to altitudes of up to 8,000 feet (2,400 meters) without special precautions. But adjusting to higher altitudes, especially above 10,000 feet (3,000 meters), can take many days or weeks. To go to that height, climbers should only increase their sleeping altitude by about 500 to 1500 feet (300 or 500 meters) a day and should take a day off from climbing higher every 3 or 4 days.
Other ways to prevent altitude sickness:
If you’ve had altitude sickness before, watch for signs you’re getting it again and travel to a lower altitude if needed.
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