Hot flashes are the symptom everyone knows. But perimenopause often starts quietly, with changes that don't look “hormonal” at all: heavier periods, a foggy brain, anxiety out of nowhere or a racing heart at night.
In short
- Perimenopause has many symptoms beyond hot flashes, and they often start in the 40s.
- Many are recognised by the World Health Organization and European menopause experts, even if they're rarely talked about.
- Noticing them together, as a pattern, is what helps you and your doctor.
Your periods can get heavier before they stop
Cycles can become shorter, longer, heavier or lighter. Heavier bleeding is common as you approach menopause, but it's worth checking with a doctor, especially if it's new. More in Heavy periods in perimenopause.
Brain fog is real
Forgetting words, losing your train of thought, walking into a room and forgetting why. Memory and concentration problems are recognised menopause symptoms, and for most women they improve with time. More in Perimenopause brain fog.
Anxiety can arrive out of nowhere
Mood changes, low mood and anxiety can appear even if you've never had them before. More in Anxiety out of nowhere in your 40s.
Your heart can race
Palpitations can be a sign of menopause. They're usually harmless, but tell your doctor about them, and get urgent help if they come with chest pain, breathlessness or fainting. More in Heart palpitations in perimenopause.
Joints, skin and hair change too
Muscle aches and joint pains, drier and itchier skin and thinning hair are all on the list of possible symptoms. More in Itchy skin in perimenopause.
Sleep gets lighter
Night sweats and lower progesterone make broken sleep common. More in Why do I wake up at 3am?
When to see a doctor
See your doctor if symptoms affect your daily life, if your bleeding is heavier than before or you bleed between periods or after sex, or if you have palpitations.
Frequently asked questions
Can perimenopause cause symptoms I've never heard of?
Yes. The list is long, and every woman's mix is different.
How do I know it's perimenopause and not something else?
Some symptoms overlap with thyroid problems, low iron or stress, so a doctor's check is worth it.
What helps first?
Writing your symptoms down for a few weeks makes the pattern much easier to see.
What would you add?
Pausie lets you log any symptom in a few taps and see what tends to show up together. No account, and your diary stays on your phone.
This article is general information, not medical advice. Written by the Pausie team. Published and last reviewed 30 October 2026.
Sources
- World Health Organization: Menopause (fact sheet)
- EMAS Menopause Essentials: Menopausal symptoms
- NHS: Heart palpitations
- Cleveland Clinic: Perimenopause