What is high-altitude cerebral edema?

High-altitude cerebral edema (HACE) is a life-threatening condition that occurs when fluid builds up in the brain at high altitudes. This fluid buildup can cause the brain to swell and compress, leading to a variety of symptoms, including:

* Headache

* Nausea

* Vomiting

* Fatigue

* Confusion

* Dizziness

* Ataxia (difficulty walking)

* Seizures

* Coma

HACE is most common in people who ascend to high altitudes rapidly, without giving their bodies time to adjust. It can occur at altitudes as low as 2,500 meters (8,200 feet), but is more likely to occur at altitudes above 4,000 meters (13,000 feet).

HACE is a medical emergency, and requires immediate treatment. Treatment may include:

* Oxygen therapy

* Medications to reduce swelling in the brain

* Medications to control nausea and vomiting

* Rest

* Descent to a lower altitude

If left untreated, HACE can be fatal.

There are a number of things you can do to reduce your risk of developing HACE, including:

* Ascending to high altitudes gradually

* Allowing your body to rest for several days at each new altitude

* Drinking plenty of fluids

* Eating a healthy diet

* Avoiding alcohol and tobacco

* Getting regular exercise

If you experience any of the symptoms of HACE, it is important to descend to a lower altitude immediately and seek medical attention.