If your period has stopped, or never started, that’s vital information. The menstrual cycle depends on a working relationship between the hypothalamus and pituitary in your brain, your ovaries, your thyroid, your adrenal glands, and your overall energy status. When menstruation stops, one of those systems is signalling that something is off. Figuring out which one is the whole job with missed periods.
This page walks through what amenorrhea is, what causes it, why it matters beyond fertility, and what an evidence-based naturopathic workup and treatment plan looks like.
What Counts as Amenorrhea
Clinicians split amenorrhea into two categories.
Primary amenorrhea
Primary amenorrhea means a period has never started. It’s evaluated by age 15 in a girl with normal breast development, or within three years of breast development starting if that happened before age 10. American Family Physician defines primary amenorrhea as the lifelong missed periods, warranting evaluation by age 15 or three years post-thelarche.
Secondary amenorrhea
Secondary amenorrhea means periods started, then stopped. The working definition is three months of missed periods in someone whose cycles were previously regular, or six months of missed periods in someone whose cycles were already irregular.
This isn’t rare. Amenorrhea unrelated to pregnancy, breastfeeding, or menopause affects roughly 3 to 4 percent of women. Pregnancy remains the single most common reason for missed periods, so that’s always the first thing to rule out.
What Actually Causes Missed Periods
Menstruation requires an intact hypothalamic-pituitary-ovarian (HPO) axis, and a uterus with a clear pathway out. Most causes of missed periods fall into a handful of buckets.
Functional Hypothalamic Amenorrhea (FHA)
This is the most common driver of secondary amenorrhea in reproductive-age women, and it’s the one many naturopathic patients arrive with. In a review of 423 girls and women evaluated for amenorrhea at a specialist center, functional hypogonadotropic hypogonadism accounted for 56 percent of primary amenorrhea cases and 78 percent of secondary cases, mostly explained by lifestyle-driven FHA linked to disordered eating, intense exercise, energy deficiency, vitamin D deficiency, and psychological stress.
FHA happens when the hypothalamus (the gland in the brain that tells the pituitary what to do) slows or stops releasing gonadotropin-releasing hormone (GnRH), usually in response to some combination of caloric restriction, high training volume, and stress. It’s a diagnosis of exclusion, meaning other causes of missed periods need to be ruled out first. FHA is a form of chronic anovulation not due to identifiable organic causes.
The mechanism has been studied closely. Research on energy availability, the amount of dietary energy (calories) left over after exercise expenditure, found that LH pulsatility becomes disrupted below a threshold of energy availability, measured by manipulating intake and exercise output in regularly menstruating women over five days. That threshold work is where the “30 kcal per kilogram of lean body mass per day” figure that shows up in sports medicine literature comes from, and it’s part of why chronic under-fuelling, even without weight loss, can shut a cycle down causing missed periods.
This overlaps heavily with what’s now called Relative Energy Deficiency in Sport (RED-S), a framework the IOC introduced to replace the older “female athlete triad” model. RED-S describes impaired physiological functioning caused by relative energy deficiency, affecting menstrual function, bone health, immunity, and cardiovascular health, among other systems, and it isn’t limited to elite athletes. It shows up in recreational exercisers, dancers, and anyone whose calorie intake hasn’t kept pace with calorie output for long enough.
Polycystic Ovary Syndrome (PCOS)
PCOS is a leading cause of secondary amenorrhea and works through a different mechanism, chronic anovulation from disrupted ovarian hormone signalling rather than energy deficiency. Most cases of secondary amenorrhea can be attributed to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, or primary ovarian insufficiency. I’ve written a separate deep dive on PCOS phenotypes and evidence-based management, since it deserves its own page.
Hyperprolactinemia
Elevated prolactin suppresses GnRH and can halt ovulation and menstruation entirely. Causes of high prolactin range from breastfeeding to pituitary adenomas to hypothyroidism to certain medications. These typically result in amenorrhea and infertility, so an elevated prolactin level requires prompt evaluation. This is one of the reasons prolactin belongs in a baseline amenorrhea workup rather than being reserved for cases that don’t otherwise resolve.
Thyroid Dysfunction
Both an underactive and an overactive thyroid can disrupt the cycle, and comprehensive thyroid testing is a standard part of my initial amenorrhea testing panel. Clinical hallmarks of thyroid disorders can lead to that diagnosis, and resumption of spontaneous menses is generally expected once a normal thyroid state is restored.
Primary Ovarian Insufficiency and Structural Causes
Primary ovarian insufficiency, chromosomal conditions like Turner syndrome, and structural issues such as Müllerian agenesis or Asherman’s syndrome (uterine scarring from prior procedures) account for a meaningful share of primary amenorrhea and some secondary cases. These require medical and sometimes surgical management outside naturopathic scope, which is exactly why ruling them out early matters.
Why an Unexplained Missed Period Isn’t Just an Inconvenience
Amenorrhea from low estrogen, most commonly seen with FHA, carries real downstream risk. Chronically low estrogen affects bone density, and the Endocrine Society guideline flags this directly: the most significant acute risks include delayed puberty, infertility, and the long-term health consequences of hypoestrogenism, including decreased bone density.
Women with FHA should receive multidisciplinary treatment, including medical, dietary, and mental health support, to avoid chronic complications ranging from infertility to depression and anxiety, and osteoporosis.
This is the part that gets missed when a missed period is treated as a nuisance to wait out, or a happy break from having a period. Bone is being built or lost the whole time cycles are absent. Anxiety and/or depression gets worse. Sleep can be disrupted.
The Naturopathic Workup
A thorough history comes first: possible pregnancy, cycle history, training volume/physical activity, dietary caloric intake, recent weight change, stress load, sleep, and medication or supplement use, including hormonal contraceptives. Physical findings matter too. We will review trends in your height, weight, and BMI. Normal breast development indicates the presence of circulating estrogen.
From there, lab work does the differentiating. Having spent years in a hospital biochemistry and hematology lab before training as an ND, this is the part of the visit I find most people haven’t had done properly. A pregnancy test comes first, always. Beyond that, a baseline panel typically includes:
- FSH and LH, to distinguish hypothalamic/pituitary causes from ovarian causes
- Estradiol (the main form of estrogen)
- TSH, free T4, free T3, anti-TPO, anti-thyroglobulin, reverse T3
- Prolactin
- Total and free testosterone, DHEAs, androstenedione, and dihydrotestosterone, if there are even minimal signs of androgen excess like hair thinning, acne, or hirsutism
- A pregnancy test, regardless of reported sexual activity
- 25-hydroxy vitamin D
- 7-9 a.m. cortisol
Depending on these findings, a referral for pelvic imaging or, in select cases, a brain MRI may be warranted, particularly if there are neurological symptoms, visual changes, or signs suggesting a pituitary problem. Select patients presumed to have hypothalamic amenorrhea should undergo a brain MRI if they exhibit severe or persistent headaches, persistent vomiting not attributable to other causes, nipple discharge, or other signs suggesting pituitary hormone deficiency or excess.
In Ontario, bloodwork ordered by a naturopathic doctor for hormone panels is not OHIP-covered, though bloodwork ordered by your family physician for most of the same markers often is.
Evidence-Based Treatment Directions for Missed Periods
Treatment for missed periods really depends on what the workup finds. There’s no single supplement or protocol that applies across every cause of amenorrhea, and any page that suggests otherwise isn’t being straight with you. What follows is what the research actually supports for the most common naturopathic-relevant cause, FHA, plus the general principles that carry across categories.
For Missed Periods Due to Functional Hypothalamic Amenorrhea
Restoring energy availability
Since the core driver is a mismatch between calorie intake and output, the first-line intervention is closing that gap, through some combination of increased caloric intake, reduced training load, or both. This is foundational, not optional, and it’s usually the hardest part for patients who are competitive athletes.
Cognitive behavioral therapy
This has the strongest clinical trial evidence of any non-pharmacological intervention for FHA specifically. In a randomized trial, of eight women treated with 20 weeks of CBT, six resumed ovulating and one had partial recovery, compared to one of eight in the observation group who resumed ovulating, a substantial difference. A follow-up trial from the same research group found CBT reduced cortisol levels in women with FHA, while the observation group showed no change in cortisol, leptin, TSH, T3, or T4, pointing to a real neuroendocrine mechanism rather than a placebo effect. This is why I refer appropriate patients for CBT alongside nutritional rehabilitation rather than treating it as an afterthought.
Addressing the psychological load, not just the calories
The same research group’s broader body of work makes the case that fertility treatment alone, without addressing the underlying stress physiology, may not fully resolve the hormonal picture and could carry added risk in pregnancy. Fertility management alone will not permit recovery of the adrenal and thyroidal axes, and initiating pregnancy without reversing the hormonal effects of chronic stress may increase the likelihood of poor obstetrical, fetal, or neonatal outcomes. That’s a strong argument for sequencing: stabilize the underlying physiology before or alongside pursuing conception.
Across All Causes of Missed Periods
- Thyroid-driven amenorrhea typically resolves once euthyroid status is achieved through appropriate thyroid management, whether that’s naturopathic support for subclinical patterns or medical management for overt hypo- or hyperthyroidism.
- PCOS-driven amenorrhea is addressed through the PCOS-specific strategies covered on my dedicated PCOS page, since the underlying mechanism and evidence base differ substantially from FHA.
- Hyperprolactinemia requires identifying and addressing the underlying cause of high prolactin, which may include stress management, medication review or referral for imaging if a pituitary lesion is suspected.
- Structural and chromosomal causes are referred to the appropriate specialist. This is outside naturopathic scope, and getting that referral moving quickly matters more than trying to manage it in-office.
When This Needs Medical Attention, Not Just Naturopathic Support
Some presentations need a physician involved from the start: primary amenorrhea by age 15, secondary amenorrhea alongside significant unintentional weight loss, signs of an eating disorder, galactorrhea (unexpected milk production), visual changes or severe headaches, or amenorrhea alongside signs of virilization such as new-onset significant hair growth or voice changes. None of these are naturopathic-only situations, and I refer or co-manage in every one of them.
Frequently Asked Questions About Missed Periods
How long can I go without a period before I should get it checked?
Three months if your cycles were previously regular, six months if they’d already become irregular. If you have missed periods alongside a big shift in training, weight, or stress, it’s worth investigating sooner rather than waiting out the window.
Dose one missed period matter?
If your period is usually regular, and perhaps you’ve been under a bout of high stress, one missed period may not be cause for concern. If there’s no explanation for missing a period, it may be worth looking into even if you only missed your period once.
Dose it matter if I miss my period if I don’t plan on having kids?
Yes! Missing a period means there is a hormone imbalance. Even if you never want children, having a regular period helps your bone density, metabolism, and mental health.
Can stress alone stop my period?
Yes. Functional hypothalamic amenorrhea (FHA) is driven by a combination of energy availability, exercise load, and psychological stress, and stress alone, without any weight change, can be enough to disrupt GnRH signalling in a susceptible person.
Will my period come back if I gain weight?
Weight is one variable, but it’s not the only one. Some people with FHA are at a stable, healthy weight and still aren’t eating enough relative to their activity level. The energy availability gap, not body weight in isolation, is the more precise target.
Is a missed period bad for my bones even if I’m not trying to get pregnant right now?
Yes. Low estrogen from prolonged amenorrhea affects bone density regardless of your fertility plans, which is part of why this isn’t something to leave unaddressed even if pregnancy isn’t the immediate concern or if you never plan on having children.
Does birth control fix amenorrhea?
It can produce a scheduled bleed, but it doesn’t address the underlying cause, whether that’s FHA, PCOS, thyroid dysfunction, or something else. It can also mask the problem, delaying an accurate diagnosis.
Dr. Pamela Frank, BSc(Hons), ND, has practiced naturopathic medicine in Toronto for over 26 years, with a clinical focus on women’s hormonal health, fertility, and thyroid conditions. Prior to her naturopathic training, she worked as a hospital medical laboratory technologist in biochemistry, hematology, and microbiology.
Missed Period References
- Klein DA, Poth MA. Amenorrhea: an approach to diagnosis and management. American Family Physician. 2013 Jun;87(11):781-788. PMID: 23939500.
- Practice Committee of the American Society for Reproductive Medicine. Electronic address: asrm@asrm.org. Current evaluation of amenorrhea: a committee opinion. Fertil Steril. 2024 Jul;122(1):52-61. doi: 10.1016/j.fertnstert.2024.02.001. Epub 2024 Mar 6. PMID: 38456861.
- Catherine M. Gordon, Kathryn E. Ackerman, Sarah L. Berga, Jay R. Kaplan, George Mastorakos, Madhusmita Misra, M. Hassan Murad, Nanette F. Santoro, Michelle P. Warren, Functional Hypothalamic Amenorrhea: An Endocrine Society Clinical Practice Guideline, The Journal of Clinical Endocrinology & Metabolism, Volume 102, Issue 5, 1 May 2017, Pages 1413–1439, https://doi.org/10.1210/jc.2017-00131
- Michopoulos V, Mancini F, Loucks T. Neuroendocrine recovery initiated by cognitive behavioral therapy in women with functional hypothalamic amenorrhea: a randomized, controlled trial. Fertility and Sterility, 2013; 99, 2084-2091.e1
- Sarah L Berga, Marsha D Marcus, Tammy L Loucks, Stefanie Hlastala, Rebecca Ringham, Marijane A Krohn,Recovery of ovarian activity in women with functional hypothalamic amenorrhea who were treated with cognitive behavior therapy, Fertility and Sterility, Volume 80, Issue 4, 2003, Pages 976-981, ISSN 0015-0282, https://doi.org/10.1016/S0015-0282(03)01124-5.
- Loucks AB, Thuma JR. Luteinizing hormone pulsatility is disrupted at a threshold of energy availability in regularly menstruating women. J Clin Endocrinol Metab. 2003 Jan;88(1):297-311. doi: 10.1210/jc.2002-020369. PMID: 12519869.
- Mountjoy M, Sundgot-Borgen JK, Burke LM, Ackerman KE, Blauwet C, Constantini N, Lebrun C, Lundy B, Melin AK, Meyer NL, Sherman RT, Tenforde AS, Klungland Torstveit M, Budgett R. IOC consensus statement on relative energy deficiency in sport (RED-S): 2018 update. Br J Sports Med. 2018 Jun;52(11):687-697. doi: 10.1136/bjsports-2018-099193. PMID: 29773536.
- Klein DA, Paradise SL, Reeder RM. Amenorrhea: A Systematic Approach to Diagnosis and Management. American Family Physician. 2019 Jul;100(1):39-48. PMID: 31259490.
- Lindsay T. Fourman, Pouneh K. Fazeli, Neuroendocrine Causes of Amenorrhea – An Update, The Journal of Clinical Endocrinology & Metabolism, Volume 100, Issue 3, 1 March 2015, Pages 812–824, https://doi.org/10.1210/jc.2014-3344