Why Might I Be Getting My Period Every 15 Days?

Family Medicine, Primary Care Roots Community Health Center, Hippo Education, Kameda Medical Center

Supervised by Kenji Taylor, MD

Getting your period every 15 days may happen when your body’s hormones are out of balance, which can lead to very short cycles.

Explanation

Normally, most women have a menstrual cycle that lasts about 28 days. If your period comes every 15 days, it means your cycle is much shorter than usual. This can be due to several things. One common reason is a hormonal imbalance. Hormones tell your body when to build up the lining of your uterus and when to shed it. If these signals change too quickly, your lining may not have enough time to build up, leading to a more frequent cycle. Conditions like polycystic ovary syndrome (PCOS) can cause this imbalance, sometimes showing up as having periods too often. Other factors, like changes in weight, stress, or differences in how your body is maturing (especially for young women who are still regulating their cycles), might play a role. It is a good idea to track your cycle and note any other changes or symptoms you experience. If this pattern continues, consider talking with a healthcare provider who can check your hormone levels and help determine the reason for these short cycles.

(References)

Long WN. Abnormal Vaginal Bleeding. In: Walker HK, Hall WD, Hurst JW, editors. Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd ed. Boston: Butterworths; 1990. Chapter 173. PMID: 21250125.
Rigon F, De Sanctis V, Bernasconi S, Bianchin L, Bona G, Bozzola M, Buzi F, Radetti G, Tatò L, Tonini G, De Sanctis C, Perissinotto E. Menstrual pattern and menstrual disorders among adolescents: an update of the Italian data. Ital J Pediatr. 2012 Aug 14;38:38. doi: 10.1186/1824-7288-38-38. PMID: 22892329; PMCID: PMC3462713.
Ganie MA, Rashid A, Baba MS, Zargar MA, Wani IA, Nisar S, Wani IA, Douhath S, Sriwastawa M, Geer MI, Asrar MM, Kutum R, Hassan S, Khan S, Rafi W, Bhat DA, Showkat W, Sahar T, Choh NA, Khurshid R, Mudassar S, Shah ZA, Shabir I, Sofi SA, Gupta N, Hafeez I, Sreenivas V. Pre-polycystic ovary syndrome and polymenorrhoea as new facets of polycystic ovary syndrome (PCOS): Evidences from a single centre data set. Clin Endocrinol (Oxf). 2023 Dec;99(6):566-578. doi: 10.1111/cen.14964. Epub 2023 Sep 1. PMID: 37656656.

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