Amenorrhea is the absence, discontinuation or abnormal stoppage of the menstrual periods in the reproductive female (1).
Amenorrhea can be either primary or secondary.
Primary amenorrhea is defined as either:
- no period by age 14 in the absence of growth and development of secondary sexual characteristics; or
- no period by age 16 regardless of the presence of normal growth and development of secondary sexual characteristics.
Secondary amenorrhea is the lack of period for at least 3 months at any time after menarche.
This can be the result of pregnancy, brain tumours, malnutrition or the like.