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Perimenopause in brief
- Perimenopause is the years before menopause, that is, before menstruation has been absent for 12 months.
- The period usually begins in the 40s, but for some it can be noticed as early as the 30s.
- The most common early sign is that the menstrual cycle changes and becomes shorter, longer or more irregular.
- Common symptoms include sleep problems, mood swings, brain fog, hot flashes, night sweats and dry mucous membranes.
- Symptoms can come and go as estrogen and progesterone levels fluctuate.
- In people over 45, perimenopause is usually assessed based on symptoms and menstrual patterns, rather than through hormone tests.
- Blood tests can be used to rule out other causes, such as anemia or thyroid disorders.
- Heavy or prolonged bleeding, bleeding after sex or Postmenopausal bleeding should always be assessed by healthcare professionals.
Perimenopause can creep up on you long before you think of the word “menopause.” You may find yourself sleeping less for no apparent reason, feeling unusually irritable, or noticing that your period suddenly doesn’t follow the same pattern as it did before. For many, the change begins with things that are easily dismissed as stress, high workload, or just being “a little out of balance.”
Perimenopause – the years before menopause
Perimenopause is the years before menopause, the time before your period has been gone for 12 months in a row. During this phase, the ovaries’ hormone production begins to vary more, especially estrogen and progesterone, and ovulation becomes less regular. This means that symptoms can come and go, vary in strength, and look different from person to person.
Perimenopause usually begins in your 40s, but symptoms can be noticed as early as your 30s for some. The transition often lasts for several years, which is why it is easily missed because the changes come gradually and have time to become a new everyday life before you connect them to hormones.
The earliest symptoms of perimenopause are often in the menstrual pattern
The most common first sign is not hot flashes, but a change in menstruation. The cycle may become shorter at first, then more irregular. The bleeding may become heavier, sparser, lighter or come more frequently than before.
Many people do not react immediately, especially if they have always had slightly variable periods. However, if a previously stable cycle suddenly begins to shift from month to month, it is a typical signal. A consistent change of about seven days or more in cycle length indicates early perimenopause, while a break of 60 days or more is often seen later in the transition.
This does not mean that all bleeding changes that occur during this period are normal. Heavy bleeding, bleeding after intercourse, new bleeding between periods or bleeding after menopause has already occurred need to be evaluated medically. Even when perimenopause is the most likely explanation, other causes should be ruled out, such as polyps, fibroid or changes in the uterine lining.
When sleep, mood and concentration change without a clear explanation
A common scenario is that a woman seeks help for fatigue, poorer stress tolerance or “brain fog” without even thinking that she may be in premenopause. Brain fog is not a strict medical diagnosis, but is used to describe forgetfulness, poorer word mobilization, difficulty focusing and a feeling of mental toughness. Such complaints are often reported during the menopausal transition.
Sleep disturbance is also common and does not always have to be due to night sweats. Some wake up more often, others fall asleep without problems but still feel sleepy. When sleep is affected, irritability, lower patience and a feeling that everyday demands have become heavier than usual often follow.
Mood swings can be amplified during perimenopause, especially in people who have previously had clear hormone-related problems such as PMS, PMDS or mood changes after pregnancy. This does not mean that all mental symptoms are due to hormones. Anxiety, depression, fatigue, thyroid disease and lack of sleep can cause similar symptoms and sometimes need to be investigated in parallel.
Hot flashes are common – but not always the first thing noticed
Hot flashes and night sweats are the best-known symptoms, but they do not have to be the first sign. Some get them early, others later. The intensity varies greatly: from a few minutes of sudden heat to sweating, palpitations and clear sleep disturbance.
It is easy to miss milder hot flashes. Some do not describe them as heat but as "getting strangely warm", having to throw off the covers or getting flushed during meetings. When the symptoms occur at night, the effect is often indirect: the first thing you notice is poorer sleep, not the hot flashes themselves.
For obvious symptoms, there is treatment. Hormone therapy is still the most effective treatment for vasomotor symptoms, i.e. hot flashes and sweating. For those who cannot or do not want to use hormones, there are also non-hormonal alternatives, but the choice should be guided by symptoms, medical history and individual risk profile.
Dry mucous membranes, urinary tract and sex drive can be affected earlier than many people think
When estrogen levels begin to drop and fluctuate, the mucous membranes in the lower abdomen and urinary tract are affected. This can cause vaginal dryness, burning, discomfort during sex, frequent urges or a feeling of having to urinate more often. Some interpret it as a recurrent urinary tract infection even though cultures are negative.
This area is often overlooked because the symptoms can feel private or embarrassing. However, the symptoms are common and treatable. Local estrogen in the vagina can be an effective alternative for urogenital symptoms, and self-care with lubricants or vaginal moisturizers can help with milder symptoms.
Sexual desire can also change, but not in the same way for everyone. For some, desire decreases when sleep, mucous membranes and mood are affected. For others, sexual function is relatively unchanged. Therefore, the assessment needs to be broader than just hormone levels and take into account relationships, stress, pain, sleep and general health.
Do you need to take a blood test to know if it is perimenopause?
Often no. In people over 45 years of age with typical symptoms, it is recommended that perimenopause is usually identified clinically, i.e. based on symptoms and menstrual patterns, not through routine hormone tests. This is because hormone levels fluctuate greatly during perimenopause and can therefore be misleading from day to day.
This is a common misconception. Many people believe that a single FSH test can provide a clear answer, but this is not always the case in this phase.
Blood tests, however, can be valuable in ruling out or detecting other conditions that can cause similar symptoms. Examples include anemia in cases of heavy bleeding, thyroid disorders in cases of palpitations and fatigue, and abnormalities in blood sugar or blood lipids when weight, energy and cardiovascular risk change in mid-life. Here, a comprehensive health check-up can provide more practical benefit.
When the symptoms are pronounced, when the bleeding deviates clearly or when the picture does not fit, a medical assessment should be made. This is particularly important in the case of:
- very heavy or prolonged bleeding
- bleeding after sex
- new bleeding after a period has not been due for 12 months
- pronounced depression, anxiety or sleep problems that affect function
- symptoms that may also indicate another illness, such as fever, involuntary weight loss or persistent abdominal pain
Perimenopause is not just a hormonal issue but often a shift in how the body signals stress. Those who recognize the pattern early have a better chance of seeking the right help, choosing treatment with thought and distinguishing normal changes from those that actually need to be investigated.
