Possession is a powerful and surprisingly prevalent belief system in many parts of the developing world. In India it is common for many reasons—isolation, illiteracy, polyglotism, lack of an adequate medical infrastructure, a need for hope. Possession, and the practice of exorcism, is more than just an explanatory system based on superstition and folk lore. It is also an important social structure and force that allows the integration of the sick into the community of the well, and facilitates a first albeit tentative step from the local community to the medical community. In many parts of India, health care delivery as well as social organization is through the practice of possession. Thus, the role and power of possession needs to be appreciated if one seeks to affect health care delivery in India, and further possession should be appreciated if one seeks to better understand how some of its forces might in fact be curative.