Signs of Perimenopause

June 12, 2026 By Khan's Medical

First Signs of Perimenopause: The Symptoms Most Women Miss

By Dr Saleem Khan
Consultant Gynaecologist
MBBS,DOWH,MRCOG, Dip Psy-sextherapy, FRCOG

First Signs of Perimenopause: The Symptoms Most Women Miss

Many women expect menopause to begin in their 50s. What often comes as a surprise is that the hormonal transition leading up to menopause—known as perimenopause—can begin much earlier, sometimes in the late 30s or early 40s.

Symptoms such as anxiety, poor sleep, weight gain, brain fog, and irregular periods are often blamed on stress, ageing, a busy lifestyle, or work pressures.

Understanding the early symptoms of perimenopause can help women recognise what is happening in their bodies and seek support before symptoms significantly impact their quality of life.

What Is Perimenopause?

Perimenopause means “around menopause” and refers to the transitional phase before menopause occurs.

During this time, the ovaries gradually produce less oestrogen and progesterone. Hormone levels fluctuate unpredictably, leading to a wide range of physical, emotional, and cognitive symptoms.

Perimenopause can last anywhere from four to ten years, with the average duration being around seven years. Menopause is officially diagnosed when a woman has gone 12 consecutive months without a menstrual period.

Many women searching for answers about perimenopause symptoms at age 40 are surprised to learn that symptoms may start years before periods stop completely.

The First Signs of Perimenopause

The earliest symptoms are often overlooked because they do not initially appear to be hormone-related.

1. Changes in Your Menstrual Cycle

One of the most common first signs of perimenopause is a change in menstrual patterns.

You may notice:

  • Irregular periods
  • Shorter menstrual cycles
  • Longer cycles
  • Heavier bleeding
  • Lighter periods
  • Spotting between periods
  • Missed periods

Hormonal fluctuations can cause ovulation to become less predictable, leading to changes in cycle length and flow.

If your previously regular periods suddenly begin changing, it may be one of the earliest indicators of perimenopause.

2. Sleep Disturbances

Many women report sleep problems as one of the first symptoms they experience.

Common complaints include:

  • Difficulty falling asleep
  • Waking frequently during the night
  • Early morning waking at 3 am or 4 am
  • Restless sleep
  • Feeling exhausted despite spending enough time in bed

Declining progesterone levels can affect the body’s natural sleep mechanisms, while fluctuating oestrogen levels may contribute to night sweats and temperature changes that disrupt sleep.

3. Anxiety, Irritability, and Mood Changes

Hormones play a vital role in regulating neurotransmitters such as serotonin and dopamine.

As hormone levels fluctuate, women may experience:

  • Anxiety
  • Irritability
  • Low mood
  • Increased stress sensitivity
  • Emotional overwhelm
  • Panic attacks
  • Loss of confidence

Many women are surprised when anxiety develops despite never having experienced it previously.

For some, mood changes become one of the most disruptive aspects of perimenopause.

4. Unexplained Weight Gain

Weight gain, particularly around the abdomen, is another common early symptom.

Women often report:

  • Increased belly fat
  • Difficulty losing weight
  • Reduced muscle tone
  • Changes in body composition despite no changes in diet or exercise

Hormonal changes can affect insulin sensitivity, metabolism, appetite regulation, and fat distribution.

5. Brain Fog and Memory Problems

One of the most frequently reported but least recognised symptoms is brain fog.

Women may experience:

  • Forgetfulness
  • Difficulty concentrating
  • Reduced focus
  • Poor short-term memory
  • Trouble finding words
  • Reduced productivity at work

Many women worry that something is seriously wrong, when in fact these cognitive changes are often linked to fluctuating hormone levels.

6. Hot Flushes and Night Sweats

Although commonly associated with menopause itself, hot flushes can begin years earlier during perimenopause.

Symptoms may include:

  • Sudden feelings of heat
  • Facial flushing
  • Sweating
  • Chills following a flush
  • Night sweats that disrupt sleep

Some women experience only occasional symptoms, while others find them severe and frequent.

7. Reduced Libido and Changes in Sexual Health

Changes in hormone levels can affect sexual desire and intimacy.

Women may notice:

  • Reduced libido
  • Vaginal dryness
  • Pain during intercourse
  • Difficulty becoming aroused
  • Reduced sexual satisfaction

These symptoms are common and often improve with appropriate support and treatment.

How to Know If You Are in Perimenopause

Many women ask, “How do I know if I am in perimenopause?”

There is no single test that definitively diagnoses perimenopause.

Diagnosis is usually based on:

  • Age
  • Symptom patterns
  • Menstrual history
  • Medical assessment

Hormone blood tests can sometimes provide useful information but may not always be reliable because hormone levels fluctuate significantly during perimenopause.

If you are experiencing several of the symptoms listed above, particularly alongside changes in your menstrual cycle, perimenopause may be the cause.

When Should You Seek Professional Help?

While perimenopause is a natural stage of life, you do not have to suffer through symptoms alone.

Consider seeking professional support if symptoms are:

  • Affecting your sleep
  • Impacting your work performance
  • Causing anxiety or depression
  • Affecting your relationships
  • Reducing your quality of life

A healthcare professional with expertise in women’s health and menopause can help you understand your options, which may include lifestyle changes, nutritional support, hormone replacement therapy (HRT), or other evidence-based treatments.

The Bottom Line

The first signs of perimenopause often appear years before menopause itself. Symptoms such as irregular periods, poor sleep, anxiety, brain fog, weight gain, and reduced libido are commonly overlooked or misattributed to stress and ageing.

Recognising these early changes can help women access the right support sooner, improve their wellbeing, and navigate this transition with greater confidence.

Perimenopause is not simply a reproductive change—it is a whole-body hormonal transition that deserves understanding, support, and expert care.

References

  • The Menopause Society. Available at: https://menopause.org
  • National Health Service. Available at: https://www.nhs.uk
  • National Institute on Aging. Available at: https://www.nia.nih.gov
  • Harlow SD, Gass M, Hall JE, et al. Menopause. 2012;19(4):387–395.
  • Santoro N. Journal of Women’s Health. 2016;25(4):332–339.
  • Avis NE, Crawford SL, Green R. Menopause. 2015;22(4):453–461.