The medical establishment has become a major threat to health'. So begins Ivan Illich's spirited and reasoned attack upon the mythic prestige of contemporary medicines, examining the customs and rituals conducted by the medical profession. Relentlessly and with full documentation taken from recognized medical sources Illich proves the impotence of medical services to change life expectancy, the insignificance of most clinical care in curing disease, the magnitude of medically inflicted damage to health, and the futility of medical and political counter measures.