It can, though often indirectly. Perimenopause commonly disrupts sleep, especially when night sweats wake you, and heavier periods can lead to iron deficiency, which is a common cause of tiredness [1][2]. If you feel exhausted most of the time, that deserves a GP conversation, not a story about yourself being lazy.
Tiredness in perimenopause is common, often because sleep problems and night sweats break up your nights [1]. Periods may get heavier, and heavy periods are one of the most common causes of iron deficiency anaemia, whose main symptom is tiredness and lack of energy [1][2]. The NHS suggests contacting your GP if you think you have perimenopause symptoms [1].
Why does perimenopause make you tired?
Not being able to get to sleep or stay asleep is a recognised perimenopause symptom, and the NHS notes sleep problems may be worse if you also have night sweats [1]. Mood changes and brain fog may feel worse when you are sleeping badly and feel very tired [1]. If your gut seems to join in at night, read how perimenopause can affect gut and sleep.
Could it be your iron?
During perimenopause, periods may happen more or less often, and bleeding may get heavier [1]. In women of reproductive age, heavy periods and pregnancy are the most common causes of iron deficiency anaemia, and its most common symptoms include tiredness and lack of energy, shortness of breath, noticeable heartbeats and pale skin [2]. A blood test can confirm it [2]. Iron tablets can bring their own gut changes, including constipation and darker poo [3].
Where does your gut come in?
Your bowel habits can shift in this life stage too, as we explored in perimenopause bowel pattern changes. The NHS lists being constipated and feeling tired all the time as a reason to see a GP [4]. Sleep and gut also seem closely linked; see poor sleep and gut health and what your gut does while you sleep.
| Possible driver | What you might notice | Who can help |
|---|---|---|
| Sleep problems and night sweats | Struggling to get to sleep or stay asleep [1] | Your GP [1] |
| Iron deficiency | Tiredness, breathlessness, palpitations, pale skin [2] | Your GP, with a blood test [2] |
| Heavier periods | Bleeding more than before [1] | Your GP [1] |
| Constipation alongside fatigue | Infrequent, hard poo and feeling tired all the time [4] | Your GP [4] |
When should you see a GP about perimenopause tiredness?
Contact your GP if you think you have perimenopause symptoms and want to know your options, if you have palpitations, or if you still have periods but are bleeding more than before [1]. See a GP if you have symptoms of iron deficiency anaemia [2]. For the wider picture, see gut health in perimenopause.
Perimenopause tiredness questions, answered
How long does perimenopause tiredness last?
There is no fixed timeline. The NHS says menopause symptoms usually last 7 to 9 years, sometimes longer, and can change over time; hot flushes and night sweats may ease and be replaced by other symptoms [1]. Tiredness may come and go with your sleep. If it is persistent or affecting daily life, talk to your GP about your options.
Can perimenopause make you tired all the time?
It can feel that way, especially when night sweats break up your sleep [1]. But constant exhaustion is worth checking, because heavy periods are a common cause of iron deficiency anaemia, which can be confirmed with a blood test [2]. If afternoons are the hardest part, the 3pm slump is worth a read.
Does perimenopause make you sleepy during the day?
Daytime sleepiness often follows poor nights. The NHS notes sleep problems can leave you irritable, stressed and anxious, and are worse with night sweats [1]. Many women report that a regular wind-down routine helps. Hormones can affect digestion too, which we covered in gut health and hormones.
Tiredness rarely has one cause, so collect clues rather than blaming yourself. Note your sleep, your periods and your energy for a few weeks, and take that to your GP. If your digestion feels different too, Gutsi, a gut health tracker, tracks your digestive patterns passively, so you can see what is normal for you with nothing to write down.
References
- NHS. Symptoms of menopause and perimenopause. Last reviewed 19 May 2026. nhs.uk
- nidirect (NHS content). Iron deficiency anaemia. nidirect.gov.uk
- NHS. Side effects of ferrous fumarate. nhs.uk
- NHS. Constipation. Last reviewed 26 October 2023. nhs.uk/conditions/constipation
Gutsi provides lifestyle and wellness insights only. It is not intended to diagnose, treat, cure or prevent any disease, and should not be used as a substitute for professional medical advice.
