Oligomenorrhea
type of menstrual disorder
Oligomenorrhea is an abnormal bleeding pattern where menstrual bleeding occurs at intervals of greater than 35 days, with fewer than 9 periods in a year. The period may be light in flow, short in duration or occur at irregular intervals. Oligomenorrhea is common in adolescent females in the first few years following menarche.
Causes of oligomenorrhea range from chromosomal abnormalities to hypothalamic-pituitary conditions to hormonal imbalances. A common cause of oligomenorrhea is polycystic ovary syndrome (PCOS), a hormonal imbalance that results in menstrual irregularity.
Menarche
Menarche is the first menstrual bleed in a female that has reached reproductive age. The median age at menarche is "12-13 years old across well-nourished populations in developed countries". While the timing of pubertal development may vary among individuals, the order in which it occurs is fairly standard. Puberty in females begins with thelarche (breast development) followed by pubarche (growth of pubic and axillary hair) then followed, typically within 2–3 years of thelarche, by menarche. During adolescence, menstrual cycle intervals and durations may vary while the hypothalamic-pituitary-ovarian axis begins to mature.
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This entry incorporates text from “Oligomenorrhea” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.