By Denise Pinto, DO
Editors Note: During her participation in the FACTS elective, Denise Pinto, a fourth-year medical student, reviewed the narrative study “Hypothalamic Amenorrhea and the Long-Term Health Consequences” by Chrisandra L. Shufelt et al., which highlights the far-reaching health implications of disrupted menstrual cycles. The findings demonstrate that functional hypothalamic amenorrhea is associated with increased risks to cardiovascular health, bone density, mental well-being, and future reproductive outcomes due to prolonged low estrogen states. Through her analysis, Pinto reinforces a central principle of fertility awareness-based methods: the menstrual cycle is a vital sign of overall health, not merely a marker of fertility.
FACTS continues to equip students and clinicians with the knowledge and tools to interpret these physiologic signals through its educational offerings. To learn more about applying fertility awareness in clinical practice, explore the FACTS elective and CME courses, which provide evidence-based training in reproductive physiology, cycle charting, and patient-centered care.
Introduction
The female cycle is a key indicator of women’s health and is considered an additional vital sign that provides insight into the body’s systems beyond the reproductive system. Regular ovulation and menstruation depend on balanced communication among the brain, hormones, and reproductive organs. When this communication is disrupted, changes in the menstrual cycle often appear first. Functional hypothalamic amenorrhea (FHA) occurs when menstrual cycles stop for several months because the brain temporarily downregulates hormone signals required for ovulation. This typically happens in response to chronic stress, inadequate nutrition, excessive exercise, disordered eating, or a combination of these factors. Importantly, FHA can be reversible, though early identification is essential.
“Functional hypothalamic amenorrhea (FHA) occurs when menstrual cycles stop for several months because the brain temporarily downregulates hormone signals required for ovulation. This typically happens in response to chronic stress, inadequate nutrition, excessive exercise, disordered eating, or a combination.”
Shufelt et al.’s narrative review research highlights FHA as more than a fertility issue, showing that the estrogen loss associated with this condition can affect many parts of the body, including the heart, bones, and mental health. [1] Fertility awareness-based methods (FABMs) emphasize the ovulatory-menstrual cycle as an important health indicator. Rather than viewing missing periods as normal or convenient, fertility awareness encourages understanding cycle changes as meaningful signals that something in the body may be out of balance.
Methodology
The reviewed literature included observational studies, cohort studies, randomized controlled trials, and long-term follow-up studies related to cardiovascular disease, bone mineral density, mental health outcomes, and fertility. The authors reviewed research involving adolescent and adult women diagnosed with FHA, as well as studies on estrogen deficiency in premenopausal women. They also incorporated animal studies examining how stress and hormonal suppression affect cardiovascular and reproductive health.
To explain the underlying mechanisms, the authors cited endocrine and physiologic research showing that suppression of gonadotropin-releasing hormone (GnRH) leads to reduced luteinizing hormone (LH), follicle-stimulating hormone (FSH), and estrogen production. Diagnostic criteria for FHA discussed in the article included at least three months of amenorrhea, low estrogen levels, low or normal gonadotropins, and exclusion of other medical causes such as thyroid disease or polycystic ovary syndrome. Treatment-related studies were also reviewed, including lifestyle interventions, cognitive behavioral therapy, hormonal treatments, and fertility therapies. [1]
“Diagnostic criteria for FHA … include at least three months of amenorrhea, low estrogen levels, low or normal gonadotropins, and exclusion of other medical causes such as thyroid disease or polycystic ovary syndrome.”
Results
The article shows that FHA has wide-ranging effects, as estrogen plays an important role throughout the body and has multisystem effects. When estrogen levels remain low for extended periods, several health systems are affected.
One major area of concern is the cardiovascular system. Estrogen maintains flexible blood vessels and promotes healthy circulation. Research summarized in the article shows that young women with low estrogen due to FHA may develop early changes in blood vessels that increase the risk of heart disease later in life, even though they are young and may not have traditional risk factors like high blood pressure or high cholesterol. [1]
Bone health is also significantly affected. Estrogen helps maintain strong bones by balancing bone breakdown and rebuilding. Without enough estrogen, bone loss can occur quickly. The article explains that women with FHA can lose bone density within months of losing their periods, increasing the risk of stress fractures and early osteoporosis. This is especially concerning because FHA often occurs during years when women should be building peak bone strength. [1]
Mental and emotional health are also closely linked to FHA. Many women with FHA experience higher levels of anxiety, depression, and difficulty coping with stress. Elevated stress hormones, such as cortisol, are common and may worsen both emotional well-being and bone health. Importantly, many women do not connect these symptoms with their missing periods. [1]
“Many women with FHA experience higher levels of anxiety, depression, and difficulty coping with stress. Elevated stress hormones, such as cortisol, are common and may worsen both emotional well-being and bone health.”
From a fertility standpoint, FHA prevents ovulation, making pregnancy unlikely until normal hormone signaling resumes. Over time, low estrogen can also affect the lining of the uterus and vaginal tissues. While FHA is considered reversible, prolonged suppression may increase the risk of miscarriage, preterm birth, and pregnancy complications once conception occurs, especially if underlying stress or nutritional issues remain unresolved. [1]
Discussion
This review warns that missed periods can have serious consequences. FHA is a signal that the body is under strain and conserving energy by reducing reproductive function. Monitoring cycle patterns allows for early identification of abnormalities. The cessation of menstruation or absence of ovulation indicates that the body may require additional support.
One key insight from the article is that using hormonal contraceptives to “bring back” bleeding does not fix FHA. While these medications can cause monthly bleeding, they do not restore natural hormone communication or prevent bone loss. This practice may delay proper diagnosis and treatment.[1] From a fertility-awareness perspective, this reinforces the importance of addressing root causes, such as inadequate nutrition, excessive exercise, or chronic stress.
A major strength of this article is its clear demonstration that estrogen affects far more than fertility. By connecting FHA to heart disease, bone loss, and mental health, the authors show why cycle health matters even for women who are not trying to conceive. The article also helps explain why women with FHA may feel “fine” at first while silent damage occurs beneath the surface.
“By connecting FHA to heart disease, bone loss, and mental health, the authors show why cycle health matters even for women who are not trying to conceive.”
Most of the studies cited in this narrative review were observational and reveal associations, not causations. There is also limited long-term research following women after recovery from FHA to see whether health risks fully resolve. More studies are needed to understand which interventions lead to lasting recovery and which women remain at higher risk.
This article reinforces the value of cycle tracking as an early identification system. Large, more recent cohort research has found that irregular or long menstrual cycles across the reproductive years are associated with a higher risk of cardiovascular disease later in life, supporting the idea that cycle changes should be taken seriously rather than dismissed as normal effects of stress. [2] More recent evidence also suggests that menstrual irregularities are linked with higher cardiometabolic and cardiovascular risk overall, further supporting the cycle as a meaningful health signal and not just a fertility marker. [3] The link between stress, eating habits, and ovulation suppression underscores the importance of holistic care focusing on proper nutrition, balanced exercise, and stress management, instead of quick solutions that merely hide underlying issues. [4] Future research should look more closely at long-term health after FHA recovery, particularly how lifestyle-based approaches compare with hormonal treatments and whether fertility-awareness education can improve earlier detection.
References
[1] Shufelt CL, Torbati T, Dutra E. Hypothalamic amenorrhea and the long-term health consequences. Semin Reprod Med. 2017;35(3):256-262.
[2] Wang YX, Arvizu M, Rich-Edwards JW, et al. Menstrual cycle regularity and length across the reproductive lifespan and risk of cardiovascular disease. JAMA Netw Open. 2022;5(2):e2144109.
[3] Afzal A, Ahmad M, Siddiqui A, et al. Menstrual irregularities and risk of cardiometabolic and cardiovascular disease: a systematic review and meta-analysis. Eur J Obstet Gynecol Reprod Biol. 2024;291:1-9.
[4] Ackerman KE, Misra M. Bone health and the female athlete triad in adolescent athletes. Phys Sportsmed. 2011;39(1):131-141.
ABOUT THE AUTHOR
Dr. Denise Pinto, DO is a recent graduate from the Philadelphia College of Osteopathic Medicine in Philadelphia, PA. She completed her undergraduate education at the University of Scranton in Scranton, PA. She will be starting her Pediatric Residency at Thomas Jefferson University/Nemours Children’s Health in Wilmington, Delaware with a special interest in preventive care, patient education, and supporting families to make informed health decisions. She enrolled in the FACTS elective to gain a deeper understanding of natural family planning and fertility awareness-based methods, and to develop the skills needed to educate and empower adolescent patients and their families to understand menstrual cycles and reproductive health from an early age.
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