A series of changes in hormone production and structures of the ovaries and uterus of the female reproductive system occurs naturally and makes gestation possible is known as the menstrual cycle. The ovarian cycle regulates the formation and release of eggs. It also regulates the cyclic release of estrogen and progesterone. The uterine cycle controls the production and maintenance of the lining of the womb to receive a fertilized egg. The median length of a complete menstrual cycle is 28 days, but it can last for 21 to 35 days in adult women. Menstrual cycle typically begins in the preadolescent or adolescent phase of a girl's life. Menopause is the time when menstrual cycle permanently stops in a woman and she is no longer able to conceive. From theories to research, case studies related to all contemporary topics of relevance to this field have been included in this book. It is compiled in such a manner, that it will provide in-depth knowledge about the clinical research on menstrual cycle and menopause. This book will serve as a valuable source of reference for graduate and post graduate students.