If you have found yourself showering twice a day, sniffing your own armpits, and quietly panicking that your deodorant has stopped working, you are in good company. On menopause forums, women describe the same things again and again: feeling as if they were imagining it, armpits that now smell oniony, a natural scent that seems to have changed completely, and relief at discovering it is not just them. The smell they describe is new, stronger, sometimes sour or oniony, and often tied to a rough night of sweating.
It is an embarrassing thing to admit out loud, which is exactly why so few people do. People talk about hiding it from partners, keeping a spare top at work, and feeling a fresh wave of self-consciousness that was not there a year ago. But a change in body odour is a physical change, not a hygiene failure and not something you imagined. Here is what is going on and what tends to help.
The short answer
The short answer: yes, your body odour can change during perimenopause and menopause. The NHS (2025) lists hormonal changes among the things that can make body odour worse, alongside sweating more than usual. As estrogen (oestrogen) falls, many people get hot flashes (hot flushes) and night sweats, which means more sweat, more often, sitting on warm skin for longer. Sweat itself is close to odourless when it leaves the skin. The smell comes from bacteria on your skin breaking down substances in sweat, particularly the secretions from the apocrine glands in your armpits and groin. More sweat gives those bacteria more to work with. None of this means you are unclean. It means the conditions on your skin have shifted. For most people the smell is manageable once you understand the mechanism, and a few targeted changes make a real difference.
Why does my body odour change during menopause?
Sweat itself is nearly odourless when it leaves your skin. A 2013 review by James and colleagues in FEMS Microbiology Ecology describes underarm odour as the result of skin bacteria transforming odourless natural secretions into strong-smelling volatile molecules.
You have two main types of sweat gland. Eccrine glands cover most of your body and release watery sweat to cool you down. Apocrine glands sit mainly in your armpits and groin, and the same 2013 review identifies their secretions as the main source of the raw material that underarm bacteria turn into odour.
That is why the armpits and groin, where apocrine glands cluster, are usually where a change shows up first. The watery sweat from the rest of your body is not the main problem on its own. The concentrated secretions in these warm, enclosed areas, combined with a large, permanent population of bacteria, are.
As estrogen (oestrogen) drops, your body’s temperature control becomes less stable, so many people sweat more often and more suddenly. More sweat and damp skin plus the same skin bacteria can mean a stronger smell. The oniony note people describe has a chemical basis: apocrine secretions contain odourless sulphur-containing precursors, and skin bacteria release sulphur compounds called thioalcohols (thiols) from them. In a study of underarm sweat, Troccaz and colleagues (2004) identified one of these, 3-methyl-3-sulfanylhexan-1-ol, and described its smell as sweaty and onion-like.
Your skin microbiome itself also changes with age. A small 2017 study by Shibagaki and colleagues in Scientific Reports found that the mix of bacteria on the skin differed markedly between women aged 21 to 37 and women aged 60 to 76. That study looked at the face, forearm and scalp rather than the armpit, so it does not prove your underarm bacteria have changed, but it shows that the skin community is not fixed across adult life, and different bacteria break sweat down into different-smelling by-products.
Why do hot flashes and night sweats make the smell worse?
Hot flashes and night sweats are sudden surges of heat and sweating. According to a 2014 review by Freedman in the Journal of Steroid Biochemistry and Molecular Biology, they are triggered by small rises in core body temperature acting within a much narrower comfort zone than usual, and that narrowing is due in part, though not entirely, to estrogen depletion at menopause. The NHS (2026) describes night sweats simply as hot flushes that happen at night.
A night sweat is a lot of fresh material for skin bacteria, left to sit on warm skin for hours. Many people notice the smell is strongest in the morning, on bedsheets, or on clothes worn during a flash.
If night-time sweating is your main trigger, it is worth reading our guides on night sweats and hot flashes, because reducing those surges tends to reduce the sweating that feeds the odour.
Does stress sweat smell different from normal sweat?
Many people say it does, though research on stress sweat in menopause specifically is thin. What is clear is that stress and anxiety can make you sweat even when you are not physically hot, and any extra sweat in the armpits and groin, where apocrine secretions and odour-producing bacteria are concentrated, gives those bacteria more to work with.
Perimenopause often arrives with more anxiety and broken sleep. The NHS (2026) lists anxiety and sleep problems among common menopause symptoms, and suggests finding ways to reduce stress as one way to ease hot flushes and night sweats. If you notice that a tense meeting leaves you smelling stronger than a workout did, you are not imagining it, and our guide to perimenopause anxiety covers that side of the picture.
Could it be something other than hormones?
The change is often hormonal, but body odour can also signal other things worth ruling out. The NHS (2025) advises seeing a GP if your usual smell has changed or you suddenly sweat much more than usual. A smell that is very distinctive, sudden, or comes with other symptoms deserves a conversation with a practitioner rather than a new deodorant.
Use the table below as a rough guide to what is likely hormonal and what is worth getting checked.
| Sign or pattern | More likely hormonal (menopause) | Worth getting checked |
|---|---|---|
| Timing | Builds gradually over months, tied to flashes and sweats | Appears suddenly with no clear trigger |
| Smell | Stronger, sour, oniony | Sweet or fruity (can relate to blood sugar), strongly fishy, or ammonia-like |
| Where | Armpits, groin, general body | Only vaginal, only breath, or only urine |
| Company it keeps | Night sweats, hot flashes, cycle changes | Weight change, thirst, fatigue, fever, pain |
| Possible other cause | Falling estrogen, stress sweat | Thyroid changes, diabetes, infection, some medications |
The NHS lists excessive sweating, weight loss, persistent thirst and tiredness among the symptoms of an overactive thyroid. It names diabetes, kidney disease, liver disease and some medicines, such as antidepressants, among the things that can make body odour worse (2025). Breath that smells fruity, like pear drops or nail polish remover, is a warning sign of diabetic ketoacidosis, a serious complication of diabetes that needs urgent care. A strong fishy vaginal smell is a typical sign of bacterial vaginosis, according to the NHS. A quick check gives you peace of mind and rules the serious causes out.
What actually helps with menopause body odour?
Start with the sweat itself. An antiperspirant reduces sweat, while a deodorant targets smell. The NHS (2025) suggests using antiperspirants and deodorants and notes that a pharmacist can recommend a stronger antiperspirant. For people who sweat heavily, the American Academy of Dermatology advises applying antiperspirant to dry skin before bedtime, partly because dry skin is less likely to become irritated.
Then reduce what bacteria have to work with. The NHS (2025) advises washing your armpits and groin at least twice a day with soap and drying them thoroughly, choosing natural fabrics such as cotton, wool and silk, and avoiding tight clothing and synthetic fabrics. Changing out of damp clothes quickly follows the same logic.
Laundry is an underrated piece of this. The NHS (2025) advises changing and washing clothes regularly, and sweat-heavy clothes and bedding are worth washing promptly rather than leaving in a damp pile. If your synthetic workout tops seem to keep their odour no matter what, natural fibres are the swap the NHS points towards.
Tackling the triggers matters most. To ease hot flushes and night sweats, the NHS (2026) suggests wearing lightweight clothing, keeping your bedroom cool at night, cutting down on alcohol, caffeine, spicy food, hot drinks and smoking, exercising regularly, and finding ways to reduce stress. All of these reduce the flashes and sweats that feed the smell.
Diet is worth a calm look rather than a crash change. The NHS (2025) suggests not eating too much strong-smelling or spicy food and not drinking too much alcohol if body odour is a problem, though no single food is to blame. There is no need for an elimination diet. Small, steady adjustments tend to tell you more than a dramatic one.
If the change is distressing or sudden, speak to a practitioner about the fuller picture, including whether treatment for your other menopause symptoms is right for you. The NHS (2025) notes that a GP can discuss prescription-strength antiperspirants and other options for heavy sweating if self-care has not helped. Body odour rarely travels alone during this stage, so it is usually most useful to look at it alongside your sleep, your flashes, and your mood rather than in isolation. Yellow, at spotyellow.com, can help you make sense of which symptoms cluster together, and our Symptom Impact Check is a simple place to start.
Frequently Asked Questions
Is body odour a sign of perimenopause?
It can be part of the picture. The NHS lists hormonal changes and sweating more than usual among things that can make body odour worse. A new or stronger smell alongside night sweats, hot flashes, irregular periods or sleep changes in your forties or fifties may point toward the transition, but on its own it is not diagnostic.
Why do my armpits suddenly smell like onions?
Underarm secretions contain odourless sulphur-containing precursors, and skin bacteria convert them into thioalcohols. One of these, identified by Troccaz and colleagues in 2004, smells sweaty and onion-like. Hot flashes and night sweats mean more sweat and damp skin, which gives bacteria more to work with, so the oniony note can become more noticeable.
Why has my deodorant stopped working?
Your deodorant probably has not changed, but your sweating may have. More frequent flashes and night sweats can overwhelm a standard product. The NHS says a pharmacist can recommend a stronger antiperspirant, and dermatologists advise applying it to dry skin before bed. Treating the sweating itself usually helps more than a stronger scent.
Can hormone changes make my vaginal odour change too?
They can. A 2018 review by Phillips and Bachmann explains that falling estrogen reduces vaginal acidity and protective lactobacilli, making infections such as bacterial vaginosis more likely. A strong fishy smell, especially after sex, is a typical sign of bacterial vaginosis, so a foul, fishy or itchy change is worth a quick check with a practitioner.
Does drinking more water reduce menopause body odour?
There is no good evidence that drinking more water on its own changes body odour. The NHS suggests a cold drink as one way to ease a hot flush, and staying hydrated matters if you are sweating heavily. For odour itself, antiperspirant, regular washing, natural fabrics and reducing triggers such as alcohol, caffeine and spicy food have clearer support.
When should I see a practitioner about body odour?
See a practitioner if the smell is sudden with no clear trigger, sweet or fruity, strongly fishy or ammonia-like, or comes with weight change, thirst, fatigue, fever, or pain. These can point to thyroid, blood sugar, or infection issues that are separate from menopause and treatable. Fruity-smelling breath with thirst and sickness needs urgent care.
Further Reading
- NHS (2025). Body odour (BO). https://www.nhs.uk/symptoms/body-odour-bo/
- NHS (2026). Menopause and perimenopause: things you can do. https://www.nhs.uk/conditions/menopause-and-perimenopause/things-you-can-do/
- James AG, Austin CJ, Cox DS, Taylor D, Calvert R (2013). Microbiological and biochemical origins of human axillary odour. FEMS Microbiology Ecology. https://pubmed.ncbi.nlm.nih.gov/23278215/
- Freedman RR (2014). Menopausal hot flashes: mechanisms, endocrinology, treatment. Journal of Steroid Biochemistry and Molecular Biology. https://pmc.ncbi.nlm.nih.gov/articles/PMC4612529/
- Phillips NA, Bachmann GA (2018). Genitourinary syndrome of menopause: common problem, effective treatments. Cleveland Clinic Journal of Medicine. https://www.ccjm.org/content/85/5/390
This article is for general information and education, and it is not medical advice. Body odour changes can have many causes, so please speak with a qualified practitioner about your own symptoms before making decisions about your health.