Amenorrhea can be classified on the basis of etiology into three subtypes, including primary amenorrhea, secondary amenorrhea, and functional amenorrhea. Primary amenorrhea can also be classified on the basis of HPG (hypothalamic-pituitary-gonadal) axis function into hypergonadotropic hypogonadism, hypogonadotropic hypogonadism, and eugonadotropic state. Secondary amenorrhea reflects an absence of menstrual cycle for at least 3 months in a woman with normal menstruation cycles in the past. Secondary amenorrhea can be classified based on pathology into polycystic ovary syndrome, hypothalamic-pituitary dysfunction, hypothalamic-pituitary failure, and ovarian failure. Functional (hypothalamic) amenorrhea is a subtype of the amenorrhea seen in patients with erratic lifestyle and can be classified on the basis of etiology into stress, weight loss, and exercise related amenorrhea.
Amenorrhea classification
Gonorrhea classification
Urethritis classification
Infertility epidemiology and demographics
Dysmenorrhea epidemiology and demographics
Amenorrhea epidemiology and demographics
Amenorrhea laboratory findings
Infertility classification