Amenorrhea means the lack of menstrual bleeding. Amenorrhea (not having a period) is normal during pregnancy, but if the person is not pregnant or breastfeeding and did not go through menopause yet, it can be a symptom that something could be wrong. Primary amenorrhea occurs when a girl did not get her first period by the age of 16. Secondary amenorrhea means that there was an absence of at least 3 menstrual periods.
- Mayo Clinic: Amenorrhea: https://www.mayoclinic.org/diseases-conditions/amenorrhea/symptoms-causes/syc-20369299 (accessed 27. July 2020)
- NIH: Eunice Kennedy Shriver National Institute of Child Health and Human Development. Amenorrhea: https://www.nichd.nih.gov/health/topics/amenorrhea (accessed 27. July 2020)
- Cleveland Clinic: Amenorrhea: https://my.clevelandclinic.org/health/diseases/3924-amenorrhea (accessed 27. July 2020)