Perimenopause: the years before menopause, and why you feel like a different person

Perimenopause literally means "around menopause". WHO defines it as the period from when the first signs of the transition appear (usually changes in your cycle) until one year after your final period.

During these years your ovaries do not simply switch off. They sputter. Estrogen and FSH swing up and down from month to month, and you ovulate less often. That rollercoaster explains the strange mix of symptoms: unpredictable periods, hot flashes, insomnia and mood changes, sometimes all in the same season.

The end point, menopause, is just one day: 12 months after your last period. Everything before it is perimenopause, and everything after is postmenopause. Our stages page breaks the transition into early and late phases.

Most women notice perimenopause in their 40s. WHO puts menopause itself between 45 and 55 for most women, and a 2012 study of Filipino women found an average age at menopause of 48.9. Since perimenopause comes before that, the early 40s are a common start.

Some women notice changes in their late 30s. That can be normal, but if your periods are changing or stopping before 40, see a doctor, because that can be premature ovarian insufficiency. Read early menopause or try the early menopause check.

"Signs of menopause at 40" is one of the most searched questions in the Philippines, and the answer is usually "signs of perimenopause". The first signs are often subtle:

• Your cycle changes. Periods come closer together, or further apart, or the flow gets heavier or lighter. For some women this is the very first sign, while periods are still more or less regular.
• Sleep gets worse. Waking at 3 am and not getting back to sleep is a classic early complaint.
• Mood shifts. Shorter fuse, anxiety you never had, or feeling flat.
• Heat waves. Hot flashes and night sweats, sometimes years before your last period.
• Brain fog. Losing words mid-sentence, forgetting why you walked into a room.
• Aches. Shoulder stiffness and lower back pain were among the top complaints in a Filipino community study (31.6% each).

Here is how Filipinas describe it in their own words on r/kwarentahin: waking before dawn, sweating more, sweat that smells different, very shallow sleep, frozen shoulder. Another listed hot flashes, nausea, always sleepy, irregular period and a short temper ("mabilis mag-init ulo"). One woman in a BPO job with US clients said she had started groping for words mid-sentence.

None of these alone proves perimenopause. Together, in your 40s, with cycle changes, they very often do. See the full symptoms list.

This is the most common question we see, and the answer surprises people: for most women over 45, you do not need a blood test.

The UK's NICE guideline (NG23) advises doctors to diagnose perimenopause in otherwise healthy women over 45 based on hot flashes or night sweats plus irregular periods, and to diagnose menopause after 12 months without a period, without lab tests. It suggests considering an FSH test only in women aged 40 to 45 with symptoms, or under 40 if premature ovarian insufficiency is suspected (NICE NG23 and QS143).

Why not just test? Because in perimenopause FSH and estradiol swing from week to week. A single result can look normal even when you are clearly in the transition, and the number rarely changes what treatment you are offered.

What your doctor might still check:

• Thyroid (TSH), since an under- or overactive thyroid can cause fatigue, weight change, palpitations and mood changes that look a lot like perimenopause. See perimenopause or thyroid?.
• Blood count, if your periods are heavy, to rule out anemia.
• A pelvic exam or ultrasound, if bleeding is very heavy or happens between periods.

For reference: FSH ₱855 per test (Exact Check), TSH ₱490 per test (Exact Check). Prices checked October 2026.

Before your visit, try our stage finder and symptom checker. Neither diagnoses you, but both give you a clear summary to show your doctor.

WHO says perimenopause can last several years. Cleveland Clinic puts the average at about 4 years, and up to about 8 for some women (Cleveland Clinic). The late phase, when you skip periods for 60 days or more, lasts about 1 to 3 years on average (STRAW+10).

It tends to come in two phases. Early on, cycles vary in length but keep coming. Later, you start skipping periods for two months or more at a time. Once you are skipping like that, your final period is usually not far off. Our stages page explains the signs that perimenopause is ending.

You ovulate less often in perimenopause, but you still ovulate sometimes, and you cannot predict which month. "Menopause baby" is a common, affectionate term in the Philippines for a reason.

Pregnancy is possible for longer than many women think. UK contraception guidance (FSRH) says that without hormonal contraception you should treat yourself as possibly fertile for 2 years after your last period if you are under 50, and 1 year if you are 50 or over; all women can stop contraception at 55 (NHS BNSSG summary of FSRH guidance). If you do not want to get pregnant, keep using contraception until your doctor tells you it is safe to stop. Some methods can also help perimenopause symptoms such as heavy bleeding. Our sister site Birth Control Philippines covers contraception in your 40s.

You do not have to wait until your periods stop to get help.

Hormone therapy (HRT). The Menopause Society (2022) says hormone therapy is the most effective treatment for hot flashes and night sweats, and for most healthy women under 60 or within 10 years of menopause the benefits outweigh the risks. In perimenopause, doctors often use sequential HRT, which usually gives a monthly bleed. PGH OB-GYN faculty at the 2025 UP Manila symposium said HRT can be started as soon as symptoms appear. See HRT for menopause and the real peso costs on costs.

Non-hormonal medicines. Some SSRIs and SNRIs, gabapentin and oxybutynin are recommended for hot flashes by The Menopause Society (2023). SSRIs can help with mood too. See non-hormonal treatments.

CBT. Recommended for hot flashes (Menopause Society 2023), and NICE (2024) says it can also help sleep problems.

Lifestyle that is backed by evidence. Weight loss is a recommended strategy for hot flashes. Strength training 2 to 3 times a week and 150 minutes of activity weekly were advised at the UP Manila symposium, especially for belly fat and bones.

Supplements. Filipinas on Reddit buy a lot of magnesium, evening primrose and soy. The Menopause Society (2023) does not recommend herbal or soy products for hot flashes. Our supplements guide gives honest ratings.

Vaginal estrogen for dryness and painful sex works well and can be used long term. See vaginal estrogen.

Filipinas on r/AskPinay report OBs who will not prescribe HRT or will not discuss it. One wrote that she knows many women who asked their OBs for HRT, were refused, and are suffering for nothing.

You are allowed to get a second opinion. Bring two or three months of symptom notes (our symptom diary stores them only on your phone), use the script on talk to your doctor, and look for a menopause-literate OB-GYN on find a doctor. The Philippine Society of Climacteric Medicine (PSCM) is the local specialty society for menopause.

Irregular periods are expected in perimenopause. These are not:

• very heavy bleeding
• bleeding between periods
• any bleeding after 12 months without a period
• a breast lump, chest pain, leg swelling or a sudden severe headache
• thoughts of harming yourself

PGH OB-GYN faculty stress exams to rule out cancer in women over 45 with abnormal bleeding. Read irregular periods and bleeding after menopause.