- Altitude-Info
 - Offers information about acute mountain sickness, high altitude pulmonary edema, high altitude syncope, prevention, and more. - High Altitude Acclimatization and Illnesses
- Offers prevention information, a description of altitude conditions, and additional reading.
- High Altitude Medical Advice for Travelers
- High Altitude Pathology Institute
- Offers articles related to altitude illness.
- Himalayan Rescue Association
- Strives to reduce casualities in the Nepal Himalaya. Offers extensive information about symptoms and prevention of altitude sickness.
- Hypoxia Online
- Offers information about the 1999 symposium, books, and other resources.
- Wikipedia: Altitude Sickness
- Hyperlinked overview discussing causes, symptoms, risks, and treatments.
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