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Published on: 7/14/2026
Why might I be getting my period every 15 days?
Getting your period every 15 days is often caused by a hormonal imbalance that shortens your menstrual cycle. Common culprits include perimenopause, thyroid disorders, polycystic ovary syndrome (PCOS), uterine fibroids, stress, or certain medications. While an occasional short cycle isn't always cause for alarm, frequent bleeding every two weeks can lead to anemia, fatigue, and may signal an underlying condition that needs attention.
Because the causes vary widely—from easily manageable stress to conditions requiring medical treatment—identifying what's driving your short cycles is the critical first step. A free, instant, online symptom check can help you pinpoint likely causes based on your specific symptoms and guide you toward the right next steps, whether that's lifestyle changes or seeing a specialist.
Reviewed for medical accuracy: 07/14/2026
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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, you can use a free AI symptom checker to better understand what might be causing your short cycles, and consider talking with a healthcare provider who can check your hormone levels and help determine the best next steps for your care.
(References)
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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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