在发达国家和发展中国家，旅游业已成为一个重要的产业，饮水安全已成为旅游医学的重要课题之一。作者报告2例外出旅行饮用含碘的净化水而发展为甲状腺功能亢进的病例。例1女性，23岁，到中美和南美旅行后乏力、腹泻5个月而就医。患者6个月内体重减轻5kg，无心悸、脱发、怕热、 Tourism has become an important industry in both developed and developing countries. Drinking water safety has become one of the major topics in tourism medicine. The authors report two cases of traveling to drinking purified iodine water to develop hyperthyroidism. Example 1 Female, 23 years old, traveling to China, the United States and South America after fatigue, diarrhea 5 months to seek medical treatment. Patients 6 months weight loss 5kg, no heart palpitations, hair loss, fear of heat,