Thailand is a popular destination for medical tourism, and is particularly well-known for sex reassignment surgery. Public hospitals in Bangkok are usually of an acceptable standard and have English-speaking doctors available, though they tend to be understaffed and overcrowded and consequently, waiting times are long. However, the quality of healthcare and availability of English-speaking medical staff can fall sharply once you leave Bangkok and head into the smaller cities and rural areas. The top private hospitals, on the other hand, are among the best in the world, and while vastly more expensive than public hospitals, are still very much affordable by Western standards.
Most major cities in Thailand have at least one private hospital that is used by Western expatriates, and while they are more expensive than public hospitals, they provide a higher standard of care with English-speaking doctors and nurses, and are still reasonably priced by Western standards.