This chapter provides detail description of Amenorrhea. Chapter has 9 well illustrated diagrams and pictures. Amenorrhea, history of amenorrhea, amenorrhea mechanism, etiology of primary amenorrhea, secondary amenorrhea, hypothalamic causes, weight related amenorrhea, obesity, stress, pseudocyesis, post pill amenorrhea, systemic disorders causing secondary amenorrhea, primary amenorrhea, do’s of amenorrhea, don’t of amenorrhea are described in detail. 2 tables are added to highlight causes of amenorrhea and frequency of endocrine disorders causing amenorrhea. 20 references are included at the end of the chapter to facilitate further reading.