Medical tourism (also called medical travel, health tourism or global healthcare) is a term initially coined by travel agencies and the mass media to describe the rapidly-growing practice of traveling across international borders to obtain health care.

Such services typically include elective procedures as well as complex specialized surgeries such as joint replacement (knee/hip), cardiac surgery, dental surgery, and cosmetic surgeries. However, virtually every type of health care, including psychiatry, alternative treatments, convalescent care and even burial services are available. As a practical matter, providers and customers commonly use informal channels of communication-connection-contract, and in such cases this tends to mean less regulatory or legal oversight to assure quality and less formal recourse to reimbursement or redress, if needed.

Over 50 countries have identified medical tourism as a national industry. However, accreditation and other measures of quality vary widely across the globe, and there are risks and ethical issues that make this method of accessing medical care controversial. Also, some destinations may become hazardous or even dangerous for medical tourists to contemplate.

Factors that have led to the increasing popularity of medical travel include the high cost of health care, long wait times for certain procedures, the ease and affordability of international travel, and improvements in both technology and standards of care in many countries.

Medical tourists can come from anywhere in the world, including Europe, the UK, Middle East, Japan, the United States, and Canada. This is because of their large populations, comparatively high wealth, the high expense of health care or lack of health care options locally, and increasingly high expectations of their populations with respect to health care. An authority at the Harvard Business School recently stated that "medical tourism is promoted much more heavily in the United Kingdom than in the United States".

A forecast by Deloitte Consulting published in August 2008 projected that medical tourism originating in the US could jump by a factor of ten over the next decade. An estimated 750,000 Americans went abroad for health care in 2007, and the report estimated that a million and a half would seek health care outside the US in 2008. The growth in medical tourism has the potential to cost US health care providers billions of dollars in lost revenue.

A large draw to medical travel is convenience and speed. Countries that operate public health-care systems are often so taxed that it can take considerable time to get non-urgent medical care. The time spent waiting for a procedure such as a hip replacement can be a year or more in Britain and Canada; however, in New Zealand, Costa Rica, Singapore, Hong Kong, Thailand, Cuba, Colombia, Philippines or India, a patient could feasibly have an operation the day after their arrival. In Canada, the number of procedures in 2005 for which people were waiting was 782,936.

Additionally, patients are finding that insurance either does not cover orthopedic surgery (such as knee/hip replacement) or imposes unreasonable restrictions on the choice of the facility, surgeon, or prosthetics to be used. Medical tourism for knee/hip replacements has emerged as one of the more widely accepted procedures because of the lower cost and minimal difficulties associated with the traveling to/from the surgery. Colombia provides a knee replacement for about $5,000 USD, including all associated fees, such as FDA-approved prosthetics and hospital stay-over expenses. However, many clinics quote prices that are not all inclusive and include only the surgeon fees associated with the procedure.

According to an article by the University of Delaware publication, UDaily:
“ The cost of surgery in India, Thailand or South Africa can be one-tenth of what it is in the United States or Western Europe, and sometimes even less. A heart-valve replacement that would cost $200,000 or more in the US, for example, goes for $10,000 in India--and that includes round-trip airfare and a brief vacation package. Similarly, a metal-free dental bridge worth $5,500 in the US costs $500 in India, a knee replacement in Thailand with six days of physical therapy costs about one-fifth of what it would in the States, and Lasik eye surgery worth $3,700 in the US is available in many other countries for only $730. Cosmetic surgery savings are even greater: A full facelift that would cost $20,000 in the US runs about $1,250 in South Africa.”

Popular medical travel worldwide destinations include: Argentina, Brunei, Cuba, Colombia, Costa Rica, Hong Kong, Hungary, India, Jordan, Lithuania, Malaysia, The Philippines, Singapore, South Africa, Thailand, and recently, Saudi Arabia, UAE, Tunisia and New Zealand.

Popular cosmetic surgery travel destinations include: Argentina, Bolivia, Brazil, Colombia, Costa Rica, Cuba, Mexico and Turkey. In South America, countries such as Argentina, Bolivia, Brazil and Colombia lead on plastic surgery medical skills relying on their experienced plastic surgeons. In Bolivia and Colombia, plastic surgery has also become quite common. According to the "Sociedad Boliviana de Cirugia Plastica y Reconstructiva", more than 70% of middle and upper class women in the country have had some form of plastic surgery. Colombia also provides advanced care in cardiovascular and transplant surgery.

In Europe Belgium, Poland and Slovakia are also breaking into the business. South Africa is taking the term "medical tourism" very literally by promoting their "medical safaris".

A specialized subset of medical tourism is reproductive tourism and reproductive outsourcing, which is the practice of traveling abroad to undergo in-vitro fertilization, surrogate pregnancy and other assisted reproductive technology treatments including freezing embryos for retro-production.

However, perceptions of medical tourism are not always positive. In places like the US, which has high standards of quality, medical tourism is viewed as risky. In some parts of the world, wider political issues can influence where medical tourists will choose to seek out health care.

Health tourism providers have developed as intermediaries to unite potential medical tourists with provider hospitals and other organisations. Companies are beginning to offer global health care options that will enable North American and European patients to access world health care at a fraction of the cost of domestic care. Companies that focus on medical value travel typically provide nurse case managers to assist patients with pre- and post-travel medical issues. They also help provide resources for follow-up care upon the patient's return.