This study examines healthcare access and the factors contributing to unmet needs among migrants in Phuket Province, Thailand. The findings reveal that unmet needs are primarily linked to undocumented status, financial barriers, and language difficulties. Employment in the fishery industry was found to significantly increase the risk of unmet healthcare needs. The results also highlight the critical role of legal authorization documents, such as work permits and visas, which not only enable migrants to obtain health insurance but also provide them with a sense of security when seeking care at government hospitals.