The number of studies on chronic and recurrent pain bears no relation to the frequency of these complaints in gynecologic practice, nor to the clinical and scientific problems that still need solving in this area. Several factors stand in the way of progress in this field, such as the strongly subjective nature of the complaints, the frequent lack of correlation between them and objective findings, and the complexity of the psychosomatic interac- tions involved. Although progress in our knowledge has been much slower than we would have wished, and although we are well aware of these many gaps, it was considered useful to gather in a book what we think we have learned during 3 decades of active interest in pain patients and pain problems in gynecologic practice and 12 years of supervision of a pain clinic in the Department of Obstetrics and Gynecology of Leuven University. As there are many differences between acute pain - clinical as well as experi- mental - on the one hand and chronic pain symptoms on the other, it was felt preferable to limit the scope of this book essentially to chronic and recurrent pain in gynecologic practice. When presented with a complaint of lower abdominal and/or low back pain, the gynecologist should constantly be on the lookout for nongynecologic causes, of which the most frequent will be either gastroenterologic or orthopedic and sometimes urologic. I have been fortunate in obtaining the collaboration of Dr.