Perimenopause is the time leading up to menopause, when hormone levels and ovulation become less predictable. Periods may change, and symptoms can include hot flushes, night sweats, sleep problems, mood changes, vaginal dryness, headaches, or joint pain. These changes vary widely, and new or unusual bleeding still needs medical assessment.

What is perimenopause?

Perimenopause means “around menopause.” It is a transition, not one test result or one exact age. During this time, the ovaries may release an egg in some cycles and not in others, and oestrogen and progesterone levels can rise and fall unevenly.

Under NICE guidance, menopause is identified after 12 months without a period when there is no other cause. Perimenopause is the time before that point. It can last for a shorter or longer time and does not feel the same for everyone.

The NICE menopause guidance says care should be tailored because symptoms can range from mild to severe and may last for different lengths of time.

How can periods change in perimenopause?

Periods may become:

• Closer together or further apart.
• Shorter or longer.
• Lighter or heavier.
• Less predictable.
• Absent for several months and then return.

Ovulation can still happen. Pregnancy may still be possible until menopause is reached, even when periods are irregular.

Do not assume every bleeding change is due to perimenopause. Bleeding between periods, after sex, or after menopause needs clinical assessment. Very heavy bleeding also deserves care.

Read how cycle days are counted if you want to summarise several cycle lengths.

What symptoms can happen?

The NHS symptom guide lists possible changes across several parts of health.

They may include:

• Hot flushes or night sweats.
• Sleep changes.
• Low mood, anxiety, irritability, or difficulty concentrating.
• Headaches or migraine changes.
• Joint and muscle aches.
• Vaginal dryness, soreness, or pain during sex.
• Urinary symptoms.
• Lower sexual desire.
• Palpitations, which feel like a fast or noticeable heartbeat.
• Skin or body-shape changes.

Symptoms may come and go. They can also overlap with thyroid conditions, anaemia, pregnancy, medicine effects, depression, anxiety, sleep disorders, and other concerns. A symptom list cannot confirm the cause.

How do clinicians assess perimenopause?

A clinician will ask about periods, symptoms, medicines, pregnancy possibility, health history, and how changes affect daily life. Tell them about bleeding between periods, after sex, or after a 12-month gap.

For otherwise healthy people aged 45 or older with typical cycle changes and hot flushes or sweats, NICE says perimenopause can often be identified without hormone blood tests. Hormone levels change during the transition, so one result may not answer the question.

Blood tests or other checks may still be useful when symptoms begin younger, the history is unclear, or another cause is possible. The plan should fit the person, not a fixed checklist.

If you use hormonal medicines, have had a hysterectomy, or do not bleed for another reason, assessment may rely more on symptoms and history.

How to prepare for an appointment

Choose the two or three changes that affect you most. This keeps the visit focused. Bring a list of medicines and supplements.

Useful notes may include:

• Period dates and flow changes.
• Hot flushes or night sweats.
• Sleep and mood changes.
• Vaginal, bladder, or sexual symptoms.
• Headaches, joint pain, or heart-racing feelings.
• The effect on work, home life, or relationships.

Ask which other causes need checking. Ask what each care option may help and what risks apply to you. Agree on when to review the plan. You can change your mind if your symptoms or goals change.

Write down any answer you want to remember. Ask who to contact if symptoms change before the review. If one concern needs more time, book another visit. You do not have to fit every question into one appointment.

Your questions are worth the time.

What care can involve

Care should focus on the symptoms that matter to you and your medical history. A clinician may discuss:

• Hormone medicines such as HRT.
• A structured cognitive and behavioural approach for hot flushes, sleep, or mood.
• Vaginal oestrogen for vaginal or urinary symptoms.
• Non-hormonal medicines in selected situations.
• Support for sleep, movement, pelvic health, sexual well-being, or mood.
• Care for heavy bleeding, migraine, bone health, or another linked concern.

Each option has benefits, risks, and limits. Personal or family history of breast cancer, blood clots, heart or liver conditions, migraine, unexplained bleeding, and other factors may affect choices.

Unregulated hormone products can vary in strength and quality. NICE advises discussing uncertainty around these products. Do not start or stop a prescribed medicine without clinical advice.

When to see a doctor

Book an appointment when symptoms affect sleep, work, mood, relationships, sex, or daily comfort. Seek advice when periods become very heavy, bleeding occurs between periods or after sex, or symptoms begin before age 45.

Bleeding after 12 months without a period should always be assessed, even if it happens once. The ACOG bleeding guide explains that changing periods can occur in perimenopause, but some bleeding patterns still need investigation.

Bring a period and symptom record if useful. Mention medicines, family history, and which changes matter most to you.

Seek care now: Get urgent medical help for very heavy bleeding with fainting, severe weakness, chest pain, or trouble breathing. Sudden severe pelvic or abdominal pain also needs prompt assessment. Contact local emergency services or go to the nearest emergency department.

Living with perimenopause day to day

Start with the symptom causing the most disruption. Trying to change sleep, food, exercise, work, and relationships all at once can add pressure.

For hot flushes, notice personal triggers without blaming yourself. Layers of clothing, a cooler sleep space, or a fan may improve comfort. For vaginal dryness or pain, a clinician can discuss moisturisers, lubricants, and medical options. You do not have to accept painful sex as part of ageing.

Mood or concentration changes can affect confidence at work and home. Ask for practical changes such as breaks, ventilation, flexible hours, or written follow-up after meetings if they would help.

If mood changes are part of the picture, include their timing and daily impact in your notes.

How to track perimenopause in Femio

Record period dates, flow, hot flushes, night sweats, sleep, mood, headaches, vaginal or urinary symptoms, and notes about daily impact. Choose only the details useful to you.

Cycle estimates become less certain when periods vary. Femio should show wider ranges rather than an exact predicted day or a “late” counter.

Tracking cannot confirm perimenopause or rule out another cause. The guide to tracking perimenopause symptoms shows how to make a useful summary. Read the heavy-period guide when bleeding is the main concern. You can also learn what menopause means and which menopause care options may be discussed.

Frequently asked questions

Can perimenopause start while periods are still regular?

Yes. Symptoms can begin before cycle changes are obvious. A clinician will consider age, symptoms, medicines, and other possible causes.

Do I need a hormone blood test?

Often not when you are 45 or older and have typical symptoms. Tests may be useful in younger people or when another cause is possible.

Can pregnancy still happen during perimenopause?

Yes. Ovulation may still occur even when periods are irregular.

These dates support conception planning and awareness. They are estimates, not a reliable way to avoid pregnancy.