Menstrual disorders describe abnormal patterns to the menstrual cycle, and are also called menstrual irregularities or menstrual dysfunction. They include several different types of irregularities, such as amenorrhea (no menstrual bleeding for 6 months or more), oligomenorrhea (menstrual bleeding at an interval of 35 days to 6 months), polymenorrhea (menstrual bleeding of more than once in 21 days), or menorrhagia (abnormally heavy or long bleeding).
- Cleveland Clinic. Abnormal Menstruation (Periods). https://my.clevelandclinic.org/health/diseases/14633-abnormal-menstruation-periods (accessed 7. August 2020)
- Mount Sinai. Menstrual disorders. https://www.mountsinai.org/health-library/report/menstrual-disorders (accessed 7. August 2020)
- NHS UK. Period problems. https://www.nhs.uk/conditions/periods/period-problems/ (accessed 7. August 2020)