Warning: Altitude Sickness Shouldn't Be Taken Lightly - Article from Health World about the effects of altitude on exercise. Outdoor Action Guide to High Altitude - Description of altitude related illnesses, their symptoms and their treatment. Supplemental Oxygen for the General Aviation Pilot - Article on determining the need for supplemental oxygen at density altitude. Hypoxia - Information about the International Hypoxia Symposium including abstracts. Medex and Medical Expeditions - Information about and from this research charity dedicated to investigating the mechanisms of altitude related illness. Newsletter archive and planned expedition information. High-Altitude Medical Guide - Information on the prevention, recognition, and treatment of altitude illness, as well as other health issues affecting travelers to destinations at altitude. High Altitude Pulmonary Edema (and me) - Personal account of an experience with HAPE. eMedicine Health - Mountain Sickness - Consumer health resource center providing information on the causes, symptoms, and treatment. WebMD - Altitude Sickness - Explains causes, symptoms, treatment and prevention. High Altitude Medicine and Biology - About the magazine published by Mary Ann Liebert, Inc. Family Practice Notebook: High Altitude Sickness - Outline of symptoms, prevention, and diagnosis for all altitude related illnesses. Altitude.org - Information about high altitude illness and physiology, and the home of the International HAPE Database - a registry of sufferers of high altitude pulmonary edema. Outdoor Places - Basic description of common illnesses encountered at various altitudes with prevention tips. Cerebral Syndromes - Article from Emergency Medicine covering cerebral syndromes in altitude sickness from AMS to HACE. Pulmonary Syndromes - Article from Emergency Medicine covering HAPE. American Academy of Family Physicians - Overview article with an informational handout for patients.