Early Signs of Menopause: How to Know It Is Starting? A Pharmacist Explains
Reviewed by Pharmacist Vilma Mendonça, CRF 9930RJ — Specialist in Phytotherapy and Homeopathy
You are 38, 41, or 44 years old. You feel like something is different, but you can’t quite put your finger on what it is. Your sleep isn’t what it used to be. Your mood swings more rapidly than before. Your period has changed becoming shorter, longer, heavier, or simply unpredictable. You feel anxious for no apparent reason. You experience a type of fatigue that sleep doesn’t fix.
You visit the doctor. Blood tests come back normal. Stress or depression is suggested. No one asks about your cycle.
But here is what they should have asked: could these be the early signs of menopause?
More than 25,000 women seek this answer every year. Most are in their late 30s or early 40s long before they expected menopause to begin. This article explains exactly what those early signs are, why they so often go unnoticed, and what you can do right now.
When do the first signs of menopause actually begin?
This is the most important point to understand something most women never hear about.
The first signs of menopause do not appear during menopause itself; they emerge during perimenopause. This is a hormonal transition that precedes the final menstrual period, typically spanning a period of 4 to 8 years.
Perimenopause can begin as early as age 35, though the most common onset is between the ages of 40 and 44. However, symptoms can appear quietly, subtly, and confusingly often years before any menstrual irregularities make it evident that hormonal changes are taking place.
About 46% of women worldwide have never heard of perimenopause. Consequently, when symptoms arise, they do so without context or explanation.
The difference between perimenopause, menopause, and postmenopause
Perimenopause: the transitional phase, lasting an average of 4 to 8 years. This is when the first symptoms appear.
Menopause: the specific point in time defined as 12 consecutive months without a period. Average age: 51.
Postmenopause: the entire period following that milestone, extending for the rest of a woman’s life.
When women ask about the “early signs of menopause,” they are almost always referring to perimenopause the phase when the body begins to signal that a hormonal shift is underway.
The First Signs. What Appears Before Hot Flashes?
Most people associate menopause with hot flashes. However, hot flashes are rarely the first symptom. Early signs are more subtle and are primarily caused by a drop in progesterone, which declines before estrogen during perimenopause.
1. Sleep changes
Difficulty falling asleep such as waking up in the middle of the night or waking up early and being unable to go back to sleep often serves as an early sign of perimenopause, appearing years before any changes in the menstrual cycle.
Progesterone promotes deep sleep by acting on the brain’s GABA receptors. When levels begin to drop, sleep architecture is disrupted. The classic pattern involves waking up between 2:00 AM and 4:00 AM, feeling alert, unable to “switch off” the mind, and often experiencing mild anxiety.
Many women at this stage are prescribed sleep medication or told they are simply “stressed,” yet few are informed that their progesterone levels are declining.
2. Mood Changes and New-Onset Anxiety
Irritability, mood swings, and anxiety often appearing seemingly out of nowhere, especially in women who have never experienced anxiety before. These are among the earliest and most frequently overlooked signs of perimenopause.
Progesterone has a direct calming effect on the nervous system. As its levels decline, the brain’s natural anti-anxiety support diminishes. Women often report feeling “on edge,” “not like themselves,” or “unable to handle situations they previously managed with ease.”
This is not psychological fragility; it is hormonal chemistry.
3. Menstrual Cycle Changes
The menstrual cycle is often the first clearly visible sign. Changes may include:
Shorter cycles: less than 25 days between periods.
Longer cycles: more than 35 days.
Heavier menstrual flow: sometimes significantly heavier, with very heavy bleeding or clots.
Lighter menstrual flow: almost imperceptible.
Spotting between periods.
Skipped cycles: periods not occurring for one or two months, then returning.
The primary clinical criterion for perimenopause is a change in cycle length of 7 days or more compared to one’s usual pattern. This often occurs years before the onset of hot flashes.
4. Brain fog
Difficulty concentrating. Forgetting words mid-sentence. Losing one’s train of thought during conversations. A feeling of mental sluggishness greater than usual. This is brain fog, and it is one of the most distressing early signs of perimenopause.
It is directly linked to the role of estrogen in supporting cognitive function specifically in the hippocampus, a brain region involved in memory and learning. As estrogen levels begin to fluctuate, cognitive sharpness can also fluctuate.
Many women at this stage fear the onset of dementia. It is not dementia; it is a hormonal issue. The situation improves as hormone levels stabilize.
5. Breast tenderness
Unexplained breast tenderness or pain particularly in the week leading up to menstruation can be an early sign of perimenopause. This is linked to the imbalance between estrogen and progesterone as both begin to undergo changes.
6. Fatigue that does not improve with rest
A profound and persistent tiredness one that does not improve with adequate sleep. It is frequently reported at the onset of perimenopause. This is caused by changes in sleep architecture, hormonal fluctuations affecting energy metabolism, and rising cortisol levels associated with a drop in progesterone.
7. Headaches and migraines
Women with a history of menstrual migraines often notice these conditions worsening during perimenopause. New headaches may also emerge. Both scenarios are linked to estrogen fluctuations typical of perimenopause, particularly the drops that occur following brief spikes in the hormone.
8. Changes in libido
Reduced sexual interest, decreased arousal, or changes in sexual response. These issues can arise early in perimenopause and are associated with a decline in testosterone (which also decreases during this transition) and progesterone.
9. Joint pain and stiffness
As estrogen levels begin to drop, their protective and anti-inflammatory role in joint tissue diminishes. Women in early perimenopause often report new joint stiffness especially in the morning affecting the fingers, knees, hips, and shoulders.
10. Skin and hair changes
Skin may become drier, less elastic, or more prone to sensitivity. Hair may thin or begin to fall out more than usual. Both changes are caused by the initial drop in estrogen a hormone that plays a key role in collagen production and hair follicle health.
Why Are Early Menopause Signs So Often Missed?
There are several reasons why the early signs of menopause go unnoticed for months or years:
The blood test issue
The standard test for menopause measures FSH (follicle-stimulating hormone). During perimenopause, FSH levels fluctuate drastically from week to week. A test performed during a period of low fluctuation may yield a completely normal result, even when a woman is already in the midst of the menopausal transition.
This means that a normal FSH result does not rule out perimenopause. Perimenopause is a clinical diagnosis; it is based on the patient’s symptoms and medical history rather than a value obtained from a blood test.
Age-related assumptions
Many healthcare professionals do not consider perimenopause when a woman is in her late 30s or early 40s. The notion that “menopause happens at age 50” creates a significant diagnostic gap regarding the long transition period that precedes it.
Fragmentation of symptoms
Since the initial symptoms of perimenopause span sleep, mood, cognition, joints, and cycles, they are often treated as isolated issues: sleep aids for insomnia, antidepressants for mood, anti-inflammatories for joints. No one connects the dots.
Factors That Bring Early Menopause Signs Sooner
Some women experience the first signs of perimenopause earlier. Risk factors include:
Smoking accelerates hormonal decline by 1 to 2 years.
Family history: if your mother entered perimenopause early, you are likely to do so as well.
Previous chemotherapy or radiation therapy can accelerate ovarian aging.
Very low body weight reduces hormonal reserves.
High chronic stress increases cortisol levels; cortisol competes with sex hormone precursors.
Autoimmune diseases associated with early ovarian changes.
Surgical removal of the ovaries causes immediate surgical menopause.
What should you do when you recognize these signs?
Track your cycles and symptoms
The most valuable diagnostic tool available to you right now costs nothing. Start tracking:
Cycle length (from the first day of one cycle to the first day of the next).
Flow intensity and any instances of spotting.
Sleep quality (interrupted nights, time spent awake).
Mood, anxiety, irritability, low mood.
Energy levels and feelings of “brain fog.”
Any physical symptoms (headaches, joint pain, breast tenderness).
Two to three months of consistent tracking provide more useful diagnostic information than any single blood test.
Ask for the right assessment
When consulting a doctor, specifically ask:
“Could these symptoms be related to perimenopause?”
“Can we check my FSH, estradiol, and AMH levels?”
“Is there a menopause specialist you could refer me to?”
AMH (anti-Müllerian hormone) offers a more accurate picture of ovarian reserve than FSH alone and can help clarify which stage of the hormonal transition you are in.
Support your hormones naturally
Note from the pharmacist – Vilma Mendonça, CRF 9930RJ:
The following interventions are scientifically backed. They support the hormonal transition during perimenopause. Always tailor usage to your individual needs under the guidance of a healthcare professional.
Magnesium glycinate (300 mg at night): Aids sleep, reduces anxiety, and combats the decline in GABA receptor activity caused by the drop in progesterone. It is one of the most effective initial interventions.
Omega-3 (EPA + DHA): Reduces systemic inflammation and supports cognitive function. Improves mood stability during hormonal fluctuations.
Ashwagandha (300 mg of standardized extract daily): Lowers cortisol levels. Improves sleep quality and supports the HPA (hypothalamus-pituitary-adrenal) axis during the hormonal transition.
Vitamins D3 + K2: Deficiency in these vitamins intensifies virtually all perimenopause symptoms. Check your levels; the goal is to maintain them between 40 and 60 ng/mL.
Soy isoflavones (40–80 mg/day): Offer mild phytoestrogenic support during the transition. Evidence suggests they reduce hot flashes and improve sleep when used consistently for 12 weeks.
Lifestyle – Non-negotiables
Resistance training. This is the lifestyle intervention with the strongest scientific backing for perimenopause. It lowers cortisol levels, preserves muscle and bone mass, improves sleep, and regulates mood. It addresses multiple early symptoms simultaneously.
Reduce alcohol consumption even moderate amounts. Alcohol disrupts sleep architecture and increases anxiety. It also intensifies hot flashes when they occur.
Prioritize sleep hygiene and maintain a regular sleep schedule. Ensure the environment is dark and cool, and avoid screens for the 30 minutes before bedtime. Consider taking magnesium at night.
Actively manage stress. Cortisol competes directly with progesterone for hormone precursors. Chronic stress exacerbates the severity of perimenopausal symptoms.
When to Seek Medical Help
Seek a professional evaluation if:
Symptoms are significantly affecting your quality of life, or if you are experiencing fragmented sleep.
Menstrual bleeding is very heavy, prolonged, or irregular to the point of causing you concern.
You are experiencing depression, rather than just mood swings.
You wish to discuss hormonal options.
Symptoms began before age 40; this could indicate premature ovarian insufficiency, which requires a specific evaluation.
Frequently Asked Questions
Can signs of early menopause appear at age 35?
Yes. Although uncommon, perimenopause can begin in your mid-30s. If symptoms are present, a medical evaluation is recommended, regardless of age.
H3: Is it normal to show signs of early menopause while still having regular menstrual cycles?
Yes; this is one of the most confusing aspects of early perimenopause. Cycle changes are often the last of the initial symptoms to appear. Sleep disturbances and mood swings as well as the sensation of “brain fog” (difficulty concentrating or slow thinking) frequently precede any menstrual irregularities by months or even years.
How can I tell if it’s perimenopause or just stress?
Both conditions can coexist and exacerbate one another. The main differentiating factor is changes in the menstrual cycle. If your periods are changing alongside mood and sleep symptoms, perimenopause is the most likely explanation. Monitor your cycle closely for 2 to 3 months and share this information with your doctor.
What is the difference between early menopause and premature menopause?
“Early menopause” refers to menopause occurring between the ages of 40 and 45. “Premature menopause” is a term sometimes used for premature ovarian insufficiency (POI), which refers to the loss of normal ovarian function before the age of 40. Both conditions require medical evaluation.
Conclusion
The first signs of menopause appear during perimenopause often years before the final menstrual period, and even before most women expect any changes.
Sleep disturbances, mood swings, and anxiety are usually the earliest signs. These are triggered by a drop in progesterone, occurring even before estrogen levels begin to decline. Changes in the menstrual cycle, brain fog, fatigue, joint pain, and headaches emerge as the transition progresses.
These signs are real. They are hormonal in origin. They are not “all in your head,” and they deserve to be taken seriously.
Start today:
Track your cycles and symptoms for 2 to 3 months.
Add magnesium glycinate to your nighttime routine.
Cut back on caffeine after noon.
Start resistance training (weightlifting) if you aren’t doing so already.
Talk to your doctor specifically about perimenopause.
Amazon links for the vitamins and supplements mentioned:
Magnesium glycinate https://amzn.to/3RMPMGR
Ashwagandha – https://amzn.to/4oyKkUu
Omega3 – https://amzn.to/49FhBXO
Vit D – https://amzn.to/4d7o1RI
Scientific References
- Harlow SD, Gass M, Hall JE, et al. Executive summary of the Stages of Reproductive Aging Workshop + 10: addressing the unfinished agenda of staging reproductive aging. Menopause. 2012;19(4):387–395. doi:10.1097/gme.0b013e31824d8f40 — PubMed
- Santoro N, Roeca C, Peters BA, Neal-Perry G. The Menopause Transition: Signs, Symptoms, and Management Options. Journal of Clinical Endocrinology & Metabolism. 2021;106(1):1–15. doi:10.1210/clinem/dgaa764 — PubMed