There are 2 types of pathological amenorrhea:
Primary: in girls who have never had menses:
Up to 14 years old in the absence of any secondary sexual characteristics (growth of pubic hair, breast growth, etc.);
Up to 16 years old, if girls have secondary sexual characteristics for 2 years and with regular pain in the lower abdomen;
Secondary: absence of menstruation for more than 3 months in previously menstruating women of reproductive age.