health tourist       
noun [ C ] mainly UK uk/ˈhelθ ˌtʊər.ɪst/ us/ˈhelθ ˌtʊr.ɪst/ (US usually medical tourist)
 (专去国外治病,尤指因目的地医疗费用更便宜的)医疗旅游者
a person who travels to a foreign country for medical treatment, especially because it is less expensive than in their own country
  Waves of health tourists fly to Malaga for a cheaper hip replacement. 成群的医疗旅游者飞往马拉加,因为当地的胯关节置换手术费用更便宜。 
 See: health tourism
 - More examples
 - Globally, nobody really knows how many health tourists there are.
 - Most health tourists in the survey were seeking care for pregnancy.
 - Three hospitals and one clinic offer services for health tourists.