Many women around 40 notice changes that worry them: their cycle gets shorter or longer for no reason, sleep becomes more unsettled, mood swings, hot flashes appear. No, it is not “all in their head.” In reality, the body has already entered an important transitional phase. In this article we explain the main symptoms of perimenopause, when this phase begins and how it can be managed.
What Is Perimenopause?
Perimenopause is the transitional phase that comes before menopause. During this time, the ovaries gradually reduce their production of estrogen and progesterone, so the cycle becomes irregular and the first symptoms of hormonal change appear.
It is important to distinguish three terms that are often confused: perimenopause is the transitional period with hormonal fluctuations; menopause is officially the point when a full year has passed without a period; and postmenopause is the rest of life after that. In other words, perimenopause is not menopause itself. It is the body’s preparation for it.
When Does Perimenopause Start?
In most women perimenopause starts between the ages of 40 and 45, although it can appear earlier or later. Its duration varies considerably: it can last from 4 to 10 years. Factors that affect the onset include genetic predisposition (mothers and sisters often enter it at similar ages), smoking (which brings the onset forward by 1 to 2 years), previous gynecological surgery and certain treatments such as chemotherapy.
If menopause occurs before age 40, it is classified as premature ovarian insufficiency and needs specialized investigation.
The Most Common Symptoms
Symptoms vary from woman to woman and usually appear gradually:
Changes in the Menstrual Cycle
- Shorter or longer cycles than you are used to.
- Skipped periods for one or more months.
- Lighter or, conversely, heavier flow. A feeling of palpitations.
Psychological and Cognitive Symptoms
- Irritability, mood changes, mild depression or anxiety.
Vasomotor Symptoms
- Hot flashes: a sudden feeling of heat in the face, neck and chest.
- Night sweats that can disrupt sleep.
- Difficulty concentrating and “brain fog.”
- Sleep problems, even without night sweats.
Other Symptoms
- Vaginal dryness and discomfort during intercourse.
- Reduced sexual desire.
- Weight gain, especially around the waist.
- Headaches or migraines related to the cycle.
Diagnosis and Medical Evaluation
Perimenopause is diagnosed mainly on clinical grounds, from the history, age and pattern of symptoms. Hormone tests (FSH, estradiol) can help, but they have limitations, since hormones in this phase fluctuate widely, even within a few weeks. The evaluation also includes a complete gynecological checkup to rule out other causes with a similar picture, such as thyroid dysfunction or anemia.
Treatment Options
Lifestyle Changes
Many symptoms can be relieved with simple measures: a balanced diet rich in calcium and vitamin D, regular physical activity with resistance exercises to protect the bones, limiting alcohol and caffeine, quitting smoking and stress management techniques.
Medical Follow-Up
For women with severe symptoms or increased risk factors (e.g. a family history of osteoporosis, cardiovascular disease), the doctor may suggest targeted treatments. Hormone replacement therapy, tailored to each case, can help with severe symptoms, and there are also non-hormonal options. The decision is always made after an informed discussion of the benefits and risks.
Health Screening
Perimenopause is an excellent opportunity for a complete women’s health checkup: mammography, bone density testing where indicated, and cardiovascular and metabolic screening. The decline in estrogen gradually increases the risk of osteoporosis and cardiovascular disease, which is why prevention at this stage is an investment for decades to come.
Perimenopause and Fertility
An important point that is often overlooked: fertility declines in perimenopause, but it is not lost. Pregnancy is still possible as long as there are periods, even irregular ones. For women who do not want a child, contraception remains necessary until menopause is confirmed. On the other hand, women who are still trying to conceive at this age need specialized guidance, since egg quality has also been affected.
The stages of perimenopause: early and late phase
The transition does not happen abruptly. International classifications divide it into two stages, based on how the cycle changes:
- Early perimenopause: cycle length starts to differ consistently by seven or more days from month to month. For example, a 24-day cycle is followed by a 33-day one. Symptoms are usually mild.
- Late perimenopause: intervals of 60 days or more without a period appear. In this phase, hot flashes and sleep problems often peak. The final period usually comes within one to three years.
Recognizing the stage helps you understand what to expect and when treatment may be needed.
Bleeding in perimenopause: what is expected and what needs checking
Changes in your period are the most typical sign of this phase. But that does not mean every bleed can be blamed on hormones. At this age there is also an increase in uterine polyps, fibroids and endometrial hyperplasia.
Ask for an evaluation if you notice:
- very heavy flow, needing to change protection every one to two hours, or large clots
- a period that lasts more than seven days
- bleeding between periods or after intercourse
- cycles that repeat less than 21 days apart
- any bleeding after 12 months without a period
Evaluation starts with a transvaginal ultrasound. If the endometrium is thick or something looks suspicious, the next step is hysteroscopy with a tissue sample. At the same time, chronic heavy blood loss is checked for iron deficiency anemia, which may explain part of the fatigue.
Hormone replacement therapy: benefits, risks and who benefits
Hormone therapy is the most effective treatment for hot flashes and night sweats. It also improves sleep and vaginal dryness and protects the bones.
Which women benefit most
Current evidence shows that for healthy women under 60, or within ten years of menopause, the benefits usually outweigh the risks when symptoms affect quality of life. Treatment can start already in perimenopause, before periods stop for good.
The risks in plain words
- Blood clots: oral estrogen increases the risk. Transdermal estrogen, as a patch or gel, does not appear to increase it significantly at usual doses.
- Breast cancer: combined estrogen and progestogen is linked to a small increase in risk, which is related to the duration of use and decreases after stopping.
- Endometrium: in a woman who has a uterus, estrogen is always combined with a progestogen to protect the endometrium.
Treatment is not usually recommended for women with a history of breast cancer, active liver disease, unexplained vaginal bleeding or a recent blood clot. The choice of product, dose and duration is personalized and reviewed every year.
Non-hormonal options for hot flashes
Not all women can or want to take hormones. There are evidence-based alternatives:
- Cognitive behavioral therapy: it does not reduce the number of hot flashes, but it significantly reduces how bothersome they are and improves sleep. British guidelines now recommend it as an option.
- Certain low-dose antidepressants: they reduce the frequency of hot flashes, even in women without depression.
- Gabapentin: useful especially for nighttime hot flashes.
- NK3 receptor antagonists: a newer class of hormone-free medications that act on the brain’s temperature control center.
Practical measures also help: dressing in layers, a cool bedroom, cutting down on alcohol and spicy foods, quitting smoking and losing weight where needed.
Genitourinary symptoms: dryness, painful intercourse, frequent urination
Unlike hot flashes, which usually ease over the years, vaginal and bladder symptoms tend to persist or get worse. The drop in estrogen thins the lining, reduces moisture and changes the vaginal flora.
The result can be:
- dryness, burning or itching
- pain or light bleeding during intercourse
- frequent urination, an urgent need to urinate or recurrent urinary tract infections
Treatment is simple and effective. Vaginal moisturizers and lubricants help with mild symptoms. Low-dose local estrogen, as a cream, tablets or a ring, is minimally absorbed into the body and can be used long term by most women. Do not put up with these symptoms out of embarrassment: they are among the most common and most easily treated problems at this age.
Contraception in perimenopause: until when and which method
Irregular periods do not mean that ovulation has stopped. Guidelines from the UK family planning society recommend contraception:
- for two years after your last period, if it happened before age 50
- for one year after your last period, if it happened after age 50
- until age 55, when contraception can be stopped by almost all women
The hormonal IUD is a particularly practical choice at this age: it provides contraception, reduces heavy flow and can serve as the progestogen part of future hormone therapy. In addition, combined birth control pills can be continued by healthy, non-smoking women without risk factors until age 50. Note that hormone replacement therapy is not a contraceptive.
Sleep, mood and memory during this transition
Many women say they “don’t recognize themselves.” Hormonal fluctuations directly affect serotonin and sleep. Night sweats interrupt sleep, and poor sleep quality in turn affects mood and concentration.
The risk of depression increases in this phase, especially in women with a history of depression, postpartum depression or severe premenstrual syndrome. Difficulty concentrating is usually temporary and improves once hormones and sleep settle. If your mood stays low for two weeks or more, ask for help. Treating vasomotor symptoms often improves mental well-being too.
Early menopause between 40 and 45
When periods stop for good between the ages of 40 and 45, it is called early menopause. It affects about 5 in 100 women. It is not a disease, but the years without estrogen before the usual age increase the risk of osteoporosis and cardiovascular disease.
That is why, in these women, hormone therapy is usually recommended at least until about age 51, provided there is no contraindication, even if symptoms are mild. The goal is not only relief but also replacing what the ovaries would normally produce.
What to discuss at your appointment with your gynecologist
A well-prepared appointment gets you more answers. Note down beforehand:
- the dates of your last few cycles and how they have changed
- which symptoms bother you most and how often
- any family history of breast cancer, blood clots, osteoporosis or heart disease
- medications and supplements you take
- whether you still need contraception
With this information, the decision about treatment is made consciously and fits your own priorities.
Conclusion
Symptoms in perimenopause do not have to be endured in silence. This is a natural phase of life that you can manage comfortably with the right information and medical support. Early recognition and preventive care improve quality of life and protect your long-term health.
For a personalized assessment and support during this transitional period, you can book an appointment at our offices in Athens and Volos.
In perimenopause, cycles often become less frequent. For the other causes, read our guide to a late period.
For a personalized assessment of your case, book an appointment with Dr. Panagiotis Polyzos at his office in Athens or Volos.
Frequently Asked Questions
At what age does perimenopause start?
Usually after 40, on average around 45 to 47. In some women the first signs already appear in their late thirties.
How long does perimenopause last?
On average four years, ranging from a few months to as long as ten years. It ends once 12 months have passed without a period.
Is having a period every 15 days normal in perimenopause?
Shorter cycles are common at the start of perimenopause. However, if bleeding is very frequent, very heavy or occurs after intercourse, testing is needed to rule out polyps, fibroids or other causes.
Can I get pregnant during perimenopause?
Yes. Fertility declines, but ovulation keeps happening irregularly. If you do not want a pregnancy, continue contraception until menopause is confirmed.
Is an FSH test needed to diagnose perimenopause?
Usually not after 45, when the history and symptoms are typical. FSH changes a lot from month to month in this phase, so one normal value does not rule it out. Tests are useful in younger women or when the picture is unclear.
How many years do hot flashes last?
On average about seven years, with big differences from woman to woman. For some they last a few months, for others more than ten years. The earlier they start in perimenopause, the longer they tend to last.
How can I tell perimenopause symptoms apart from a thyroid problem?
Fatigue, weight changes, sleep problems, palpitations and changes in your period appear in both. A simple TSH test rules out the thyroid and is worth doing, because thyroid disorders are common at this age.
Does hormone therapy increase the risk of breast cancer?
Combined estrogen and progestogen is linked to a small increase in risk that depends on the duration of use. Estrogen alone, in women without a uterus, has little or no effect. Your personal risk is discussed with your doctor before you start.