Abstract: This research is about a study of behaviors of medical tourists who use medical service and travel in Thailand. A group of samples in the research is mainly the medical tourists who use the medical tourism agencies in top private hospitals in Bangkok, Thailand. The results about the behaviors of the medical tourists will be analyzed for planning a marketing strategy in order to be a guideline in running business of the medical tourism agencies for conforming to the behaviors of the travelers. In the future, it will be profitable to the medical tourism in Thailand.