The right to health is one of the most complex rights in the lexicon of human rights. In brief, it has four essential elements: availability. Accessibility, acceptability and quality (AAAQ). In other words, health care and the underlying determinants of health must be available throughout the country; acceptable in terms of medical ethics and sensitive to cultures, communities and gender; and of good quality. In addition, there are six concepts crucial to the right to health. These are progressive realization, core obligation, equality and non-discrimination, participation, information and accountability. These four essential elements and six crucial features of the right to health are outlines in Box 2