N94: Pain and other conditions associated with female genital organs and menstrual cycle

N94.8: Other specified conditions associated with female genital organs and menstrual cycle

The internal female genital organs include the uterus, the fallopian tubes and ovaries. The vagina is also one of the internal genital organs and goes from the uterus to the outside of the body. The external female genital organs include the labia, the clitoris and the skin around the vagina.

This lining of the uterus thickens at the start of each normal menstrual cycle. It is then expelled when you have your period. This process is controlled by various sex hormones.