Elizabeth Lavis got altitude psychosis while hiking in the Bolivian Andes.Elizabeth LavisElizabeth Lavis planned to hike the ninth-highest mountain in the Bolivian Andes for her 40th birthday.She climbed too quickly, without ample preparation or acclimation, and got altitude psychosis.She still hikes but now follows some hard rules to stay safe.The condors appeared at 5,000 meters.