A group of women were interviewed about their construction of their illness experiences before they saw a physician and subsequently over a period of several months following consultation. It was found that the physician's input was one of many components of their post-consultation understanding of their illnesses. The women built up their understandings in an interactive process, drawing significantly on their prior histories, ongoing experiences and social worlds. They continually tried out, adjusted and reworked the construction of their illnesses to adapt them to the exigencies of everyday life. We conclude that illness explanations are dynamic entities whose adequacy is determined by their usefulness within the extra-medical social environment.