“My neurological doctor thought I had a brain tumor before I self-diagnosed and treated for ‘Magee's Disease’. He sent me through CT and MRI brain scanners looking for it. I later discovered I had ‘Altitude Hypersensitivity' and I was very reactive to altitudes above 1,000 feet, bringing on severe altitude sickness symptoms that were affecting the brain. I had been breathing oxygen, nitrogen, helium, carbon dioxide and mercury polluted air at high altitude during a decade of working in professional astronomy.” MercuryCarbon DioxideNitrogenAltitude HypersensitivityAltitude SicknessHeliumBrain TumorMagee S DiseaseBreathing OxygenPolluted Air Author:Steven Magee