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Today I learned about altitude sickness. You can get altitude sickness starting at about 8000 feet. Symptoms include headache, fatigue, dizziness, nausea/vomiting, and swelling in the extremities. Symptoms will usually subside after you have a day or two to adjust to the altitude. In rare cases you can wind up with pulmonary or cerebral edema (fluid in the lungs or brain). High altitude cerebral edema can kill you. If you go up slowly (1000 feet per day) you won't have a problem.