Changes in Body Odour During Perimenopause

It is not something you will find on most lists of perimenopause symptoms, but changes in body odour are real and more common than most women realise. If you have noticed that your natural scent has changed, that your usual deodorant no longer seems effective, or that you are sweating more than before, hormonal shifts are very likely involved.

Why Body Odour Changes

Body odour is produced when bacteria on your skin break down compounds in your sweat. The composition of your sweat, the bacteria living on your skin, and how much you perspire are all influenced by hormones. During perimenopause, all three can change.

Increased sweating The vasomotor instability that causes hot flashes and night sweats also increases overall sweating. More sweat means more material for bacteria to work with, which can increase body odour even if the sweat composition stays the same.

Sweat composition changes Research published in Chemical Senses found that the chemical composition of sweat changes with hormonal status. Estrogen and progesterone influence the types and concentrations of fatty acids, steroids, and other compounds secreted in sweat. As these hormone levels shift during perimenopause, the raw material of your body odour changes too (Havlicek et al., 2017).

A Japanese study published in the Journal of Investigative Dermatology identified a specific compound called 2-nonenal that increases with age and hormonal changes. The researchers found that this unsaturated aldehyde, produced by the oxidative degradation of skin lipids, contributes to the characteristic shift in body odour during midlife.

Changes to the skin microbiome The community of bacteria living on your skin is influenced by hormones, skin pH, sebum production, and moisture levels. All of these change during perimenopause. A study in Scientific Reports found that the skin microbiome shifts significantly during the menopause transition, which can alter how sweat is metabolised and what odours are produced.

Stress sweat The anxiety and stress that often accompany perimenopause trigger a different type of sweat than physical exertion. Stress sweat comes from the apocrine glands (concentrated in the armpits and groin) rather than the eccrine glands that cover most of the body. Apocrine sweat contains more proteins and lipids, which bacteria break down into more pungent compounds. This is why nervous sweating often smells stronger than exercise sweating.

What You Might Notice

Changes can be subtle or quite obvious:

Your usual deodorant no longer works as well
A different quality to your natural scent that you cannot quite place
Stronger odour after night sweats
Sweating more in situations where you previously stayed dry
Changes in vaginal odour (which can relate to pH shifts and altered vaginal flora, similar to the changes involved in vaginal dryness)

What Helps

Hygiene Adjustments

Simple changes to your routine can make a significant difference:

Switch to a stronger antiperspirant rather than just deodorant. Antiperspirants contain aluminium compounds that reduce sweat production, while deodorants only mask odour. Clinical-strength formulations are available over the counter
Apply antiperspirant at night: this may sound odd, but research shows it is more effective when applied to dry skin before bed, allowing the active ingredients to enter the sweat ducts overnight
Wear breathable natural fibres: cotton, linen, and merino wool allow sweat to evaporate rather than being trapped against the skin. Synthetic fabrics tend to harbour more odour-producing bacteria
Change clothes after sweating: do not let damp, sweaty clothing sit against your skin

Diet Considerations

What you eat affects how you smell. Research confirms that certain foods influence body odour:

Cruciferous vegetables (broccoli, cabbage, cauliflower) contain sulphur compounds that can affect sweat odour
Garlic and onions release allyl methyl sulphide through the skin
Red meat consumption has been associated with stronger body odour in studies
Alcohol is metabolised partly through sweat and breath

This does not mean you need to avoid these foods entirely, but if body odour is a particular concern, it may be worth paying attention to any dietary patterns. Our perimenopause nutrition guide covers broader dietary strategies for the transition.

Manage the Triggers

Since increased sweating drives much of the change in body odour, managing hot flashes and night sweats can help. Hormone therapy is the most effective treatment for vasomotor symptoms and, by reducing sweating, can also reduce body odour changes.

Stress management is another lever. If stress sweat is a factor, techniques like deep breathing, mindfulness, and regular exercise can reduce the frequency of stress-related sweating.

Medical Options

If excessive sweating (hyperhidrosis) is a significant problem beyond normal hot flashes:

Prescription-strength antiperspirants containing higher concentrations of aluminium chloride
Botulinum toxin (Botox) injections in the underarms can reduce sweat production for several months. Research in the Journal of the American Academy of Dermatology found it effective for excessive axillary sweating
Certain medications can reduce overall sweating, though side effects need to be weighed

Vaginal Odour Changes

Changes in vaginal odour during perimenopause are usually related to shifts in vaginal pH and bacterial balance rather than poor hygiene. The same estrogen decline that causes vaginal dryness alters the vaginal environment.

Do not use internal douches or strongly scented products, which disrupt the vaginal microbiome further. If you notice a persistent strong or unpleasant vaginal odour, see your doctor to rule out infection (bacterial vaginosis is more common during the menopause transition).

When to See Your Doctor

While body odour changes during perimenopause are generally harmless, see your doctor if:

The change is very sudden or dramatic
You have other symptoms like excessive thirst, unexplained weight loss, or fever (which could indicate metabolic conditions)
You notice a strong, persistent vaginal odour
Sweating is so excessive it interferes with daily life
You are concerned about any change that does not feel right

Your doctor can check for thyroid dysfunction, diabetes, and other conditions that can affect body odour and sweating patterns.

Sources:

Havlicek, J. et al. (2017). Body odour quality predicts behavioral attractiveness in humans. Chemical Senses, 42(4), 325-333
Haze, S. et al. (2001). 2-Nonenal newly found in human body odor tends to increase with aging. Journal of Investigative Dermatology, 116(4), 520-524
Callewaert, C. et al. (2019). Skin microbiome transplantation and manipulation: current state of the art. Scientific Reports, 9, 1421
Study of Women's Health Across the Nation (SWAN), National Institutes of Health