The rhetoric of "needs" has been used to legitimate all major turns in UK health policy since 1938. This study identifies the ethical, policy, and technical issues arising from the concept of needs. In the first part a theory of needs is developed, which takes into account both the philosophical traditions and the practical problems arising in daily health care. In a second part, health systems throughout the world are described and compared, addressing ethical as well as economic querstions. Its interdisciplinary approach will make "The Need for" "Health Care" important reading not only for students of philosophy, but also for those interested in or employed in the health sector.