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Acute Mountain Sickness

What Is Acute Mountain Sickness?

Hikers, skiers, and adventurers who travel to high altitudes can sometimes develop acute mountain sickness. Other names for this condition are altitude sickness or high altitude pulmonary edema. It typically occurs at about 8,000 feet, or 2,400 meters, above sea level. Dizziness, nausea, headaches, and shortness of breath are a few symptoms of this condition. Most instances of altitude sickness are mild and heal quickly. In rare cases, altitude sickness can become severe and cause complications with the lungs or brain.

What Causes Acute Mountain Sickness?

Higher altitudes have lower levels of oxygen and decreased air pressure. When you travel in a plane, drive or hike up a mountain, or go skiing, your body may not have enough time to adjust. This can result in altitude sickness. Your level of exertion also plays a role. Pushing yourself to quickly hike up a mountain, for example, may cause acute mountain sickness.

Who Is at Risk for Acute Mountain Sickness?

Your risk of experiencing acute mountain sickness is greater if you live by or near the sea and are unaccustomed to higher altitudes. Other risk factors include:

  • quick movement to high altitudes
  • physical exertion while traveling to a higher altitude
  • traveling to extreme heights
  • a low red blood cell count due to anemia
  • heart or lung disease
  • past bouts of acute mountain sickness

What Are the Symptoms of Acute Mountain Sickness?

The symptoms of altitude sickness generally appear within hours of moving to higher altitudes. They vary depending on the severity of your condition. If you have a mild case, you may experience:

  • dizziness
  • headache
  • muscle aches
  • insomnia
  • nausea and vomiting
  • irritability
  • loss of appetite
  • swelling of the hands, feet, and face
  • rapid heartbeat
  • shortness of breath with physical exertion

Severe cases of acute mountain sickness can cause more intense symptoms and affect your heart, lungs, muscles, and nervous system. For example, you may experience confusion as a result of brain swelling. You may also suffer from shortness of breath due to fluid in the lungs.

Symptoms of severe altitude sickness may include:

  • coughing
  • chest congestion
  • pale complexion and skin discoloration
  • inability to walk or lack of balance
  • social withdrawal

Seek medical attention as soon as possible. The condition is much easier to treat if you address it before it progresses.

How Is Acute Mountain Sickness Diagnosed?

Your doctor will ask you to describe your symptoms, activities, and recent travels. During the exam, your doctor will most likely use a stethoscope to listen for fluid in your lungs. To pinpoint the severity of the condition, your doctor may also order a chest X-ray.

How Is Acute Mountain Sickness Treated?

Treatment for acute mountain sickness varies depending on its severity. You might be able to avoid complications by simply returning to a lower altitude. Hospitalization is necessary if your doctor determines that you have brain swelling or fluid in your lungs. You may receive oxygen if you have breathing issues.


Medications for altitude sickness include:

  • acetazolamide to correct breathing problems
  • blood pressure medicine
  • lung inhalers
  • dexamethasone to decrease brain swelling
  • aspirin for headache relief

Other Treatments

Some basic interventions may be able to treat milder conditions, including:

  • returning to a lower altitude
  • reducing your activity level
  • resting for at least a day before moving to a higher altitude
  • hydrating with water

How Can I Prevent Acute Mountain Sickness?

There are some important preventive steps you can take to reduce your chances of acute mountain sickness. Get a physical to make sure you have no serious health issues. Review the symptoms of mountain sickness so you can recognize and treat them quickly if they occur. If traveling to extreme altitudes (higher than 10,000 feet, for example), ask your doctor about acetazolamide, a medication that can ease your body’s adjustment to high altitudes. Taking it the day before you climb and on the first day or two can lessen your symptoms.

When climbing to higher altitudes, prevent acute mountain sickness by doing the following:

  • Climb gradually, if possible. Instead of moving from 0 to 8,000 feet in one day, rest for a day after every 2,000 feet.
  • Return to lower altitudes to sleep to give your body a break.
  • Carry oxygen with you when climbing above 9,000 feet.
  • Drink plenty of fluids.
  • Avoid alcoholic beverages.
  • Eat frequent, high-carbohydrate meals.
  • Avoid unnecessary physical exertion, particularly in the initial climb.

You should also avoid climbing to high altitudes if you have certain medical conditions or restrictions. Having anemia causes a low red blood cell count, which reduces the amount of oxygen in your blood. Ask your doctor about taking an iron supplement, and treat the issue before going to high altitudes.

If you have either heart or lung disease, the combination of high altitudes and low oxygen can be difficult to endure.

If you take medications like sleeping pills, narcotic pain relievers, or tranquilizers, check with your doctor before climbing to high altitudes. These medications can lower your breathing rate.

You should also avoid climbing to high altitudes if you felt ill in the past during previous climbs.

What Is the Long-Term Outlook?

Most people are able to recover from a mild case of acute mountain sickness quickly after returning to lower altitudes. Symptoms typically subside within hours, but may last up to two days. However, if your condition is severe and you have little access to treatment, complications can lead to swelling in the brain and lungs, resulting in coma or death. It’s essential to plan ahead when traveling to high altitude locations.

Content licensed from:

Written by: George Krucik, MD, MBA
Published on: Jul 16, 2012on: Mar 23, 2017

This feature is for informational purposes only and should not be used to replace the care and information received from your health care provider. Please consult a health care professional with any health concerns you may have.
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