Why Do My Armpits Still Smell After Showering?

Why Do My Armpits Still Smell After Showering?

You showered. You washed properly. You put on clean clothes.

And somehow, twenty minutes later, you can still smell your underarms.

It is frustrating because it feels like the obvious explanation should be poor hygiene. But very often, it is not.

Body odour is not simply a question of how clean you are. It is a question of bacteria, sweat, skin chemistry and, surprisingly often, the clothes you are wearing.

Once you understand what is actually creating the smell, it becomes much easier to deal with it.

First, sweat itself is not the smell

Fresh sweat has very little odour.

The familiar underarm smell develops when bacteria living naturally on the skin break down compounds in sweat and turn them into volatile molecules that we recognise as body odour. Research on the underarm microbiome has repeatedly shown that specific bacterial populations are closely linked with axillary odour.¹

That means washing the sweat away is only part of the picture.

You can shower, remove most of the sweat and still have bacteria present on the skin. As soon as you begin sweating again, even slightly, the process starts again.

That does not mean your underarms are dirty.

It means they are an active biological environment.

Why can the smell come back so quickly after a shower?

There are a few common reasons.

1. The bacteria are still there

Soap and water remove sweat, oils and a significant amount of surface bacteria, but your skin is not supposed to become sterile.

Your underarms have their own microbiome, just like the rest of your skin.

As soon as sweat returns, those bacteria have new material to work with. Depending on your individual microbiome, that can happen surprisingly quickly.

This is why deodorant works differently from simply washing.

A good deodorant is not there just to cover an existing smell with fragrance. It helps make the underarm environment less favourable to the bacteria responsible for producing odour in the first place.

2. The smell may actually be coming from your T-shirt

This is one people often miss.

You can have freshly washed skin and still smell body odour because the fabric sitting directly against your underarms is holding onto it.

Sweat, skin oils, bacteria and odour compounds transfer from your body into clothing. Research has shown that the type of fabric affects which bacteria grow on it and how strongly it smells. In one study, polyester T-shirts developed a significantly stronger and less pleasant odour than cotton after exercise, and more recent research has continued to link specific odour-producing bacteria with sweaty polyester sportswear.²

So if your underarms smell clean when you step out of the shower but the smell seems to return almost immediately after getting dressed, your top may be part of the problem.

This is especially common with synthetic gym wear, fitted tops and fabrics that have been worn repeatedly.

3. Washing clothes does not always reset them completely

Clothes have their own microbiome too.

Studies looking at washed T-shirts have found that bacteria can still be detected in clothing after laundering, and the bacterial community varies according to the fabric and the person wearing it.³

This helps explain that strange situation where a T-shirt smells perfectly fine when it comes out of the wardrobe, but the moment it warms up against your body, the old underarm smell seems to come back.

Sometimes what you think is your deodorant failing is actually an old smell being released from the fabric.

Before throwing away your deodorant, try changing the shirt.

It sounds almost too simple, but it can tell you a lot.

4. You may be trying to cover odour rather than control what creates it

A heavily fragranced product can make you smell pleasant for a while without doing much to the environment that produces body odour.

Once the fragrance fades, the original smell becomes noticeable again.

This is one of the reasons we care so much about the deodorising mechanism itself at Pure & Bloom.

Our formula is led by Magnesium Hydroxide rather than relying on fragrance to disguise odour or high levels of baking soda to control it.

Magnesium Hydroxide helps create an environment on the skin that is less favourable to odour-causing bacteria.

Sodium Bicarbonate is also present, but at around 3%, where it supports the formula rather than doing most of the work.

The aim is not to smell stronger than body odour.

It is to deal with the reason that odour develops.

5. You may simply be sweating again

A shower does not switch off your sweat glands.

If the bathroom is warm, you are rushing to get ready, you have just exercised or you are stressed, sweating can restart almost immediately.

And that is normal.

Deodorant and antiperspirant are often spoken about as if they do the same job, but they do not.

An antiperspirant reduces sweating by blocking sweat ducts.

A deodorant allows you to sweat normally and focuses on controlling the odour that develops afterwards.

Pure & Bloom is a deodorant, not an antiperspirant.

You will still sweat.

That is not the product failing.

The job is to keep that sweat from turning into the smell you are trying to avoid.

Why does one person smell more quickly than another?

Because underarms are surprisingly individual.

The number and type of bacteria living there varies from person to person, as does sweat composition, how much someone sweats, clothing choice and even how the underarm microbiome has been shaped by previous deodorant or antiperspirant use.

Research has shown a relationship between bacterial load and the intensity of underarm odour.¹

That is why two people can use exactly the same deodorant and have very different experiences.

It is also why the idea that body odour simply means someone has not washed properly is far too simplistic.

What should you do if your armpits still smell after washing?

Start by working out where the smell is actually coming from.

Wash and dry your underarms thoroughly, then wait a few minutes before putting your clothes on.

If your skin smells clean but the odour appears after you put on a particular top, look at the clothing rather than your deodorant first.

Pay attention to synthetic fabrics, especially polyester sportswear, and notice whether certain tops seem to bring the smell back much faster than others.

Make sure your underarms are completely dry before applying deodorant.

And rather than constantly layering fragrance over the smell, choose a deodorant designed to control the conditions that allow odour-causing bacteria to thrive.

The NHS also recommends washing and drying the underarms thoroughly, changing and washing clothes regularly and choosing natural fabrics such as cotton where appropriate.

What if nothing seems to help?

Body odour is extremely common, and most of the time it can be managed with normal hygiene, clothing changes and the right deodorant.

But if your body odour suddenly changes, becomes significantly stronger than usual or continues despite trying to manage it, it is worth speaking to a pharmacist or GP.

Changes in sweating or body odour can occasionally be associated with medications, hormonal changes or health conditions, so a persistent new change should not simply be covered up. The NHS specifically advises seeking medical advice if body odour does not improve with self-care, changes from your normal smell or is accompanied by suddenly increased sweating.

This article is for general information and is not a substitute for medical advice.

Where Pure & Bloom fits

Pure & Bloom was designed around a simple idea: deodorant should manage odour without treating normal sweating as something that needs to be stopped.

Magnesium Hydroxide is the lead deodorising ingredient in our formula.

A small amount of Sodium Bicarbonate supports it.

Arrowroot and Kaolin help absorb moisture.

Mango Butter, Shea Butter, Squalane, Calendula and Bisabolol are there because your underarms are still skin, and a product used there every day should treat them that way.

And instead of using fragrance as a way to hide what is happening underneath, every essential oil in our scents is named individually on the label.

The formula is there to do the work.

The scent is there because using it should also feel good.

The honest version

If your underarms still smell after showering, it does not automatically mean you need to scrub harder, shower more often or cover yourself in stronger fragrance.

The smell may be returning because bacteria are beginning to break down fresh sweat again.

It may be sitting in your clothes.

Or your deodorant may simply be masking odour rather than managing what causes it.

Body odour is biology, not a cleanliness test.

Once you start treating it that way, choosing the right solution becomes much easier.

Pure & Bloom is handmade in small batches in Yorkshire and comes in 60ml amber glass jars with bamboo lids, available in Citrus Paradise, Blossom Soft, Moss & Wood and Cloud Serenity.

If you want a deodorant designed to control odour while allowing your body to sweat normally, explore the Pure & Bloom range at pureandbloom.co.uk.

Frequently Asked Questions

Why do my armpits smell even after I shower?
Underarm odour is created when bacteria on the skin break down compounds in sweat. Washing removes sweat and reduces bacteria, but it does not make your skin sterile, so odour can return once you begin sweating again.

Why do my armpits smell clean until I put my T-shirt on?
Your clothing may be holding onto bacteria and odour compounds from previous wear. Synthetic fabrics such as polyester can retain and develop stronger body odour than some natural fibres.

Can clothes still smell after washing?
Yes. Bacteria and odour compounds can remain in textiles after laundering, particularly in garments that are worn repeatedly around the underarms.

Does deodorant stop sweat?
No. Deodorant is designed to manage odour. Antiperspirant is designed to reduce sweating by temporarily blocking sweat ducts.

Why does deodorant stop working during the day?
Odour can return as sweat and bacteria build up, particularly if the formula mainly masks smell with fragrance rather than controlling the environment that produces it. Clothing can also make it seem as though deodorant has stopped working.

What deodorant ingredient helps control odour-causing bacteria?
Magnesium Hydroxide is commonly used in natural deodorants because it helps create conditions that are less favourable to odour-causing bacteria without stopping normal sweating.

Is Pure & Bloom an antiperspirant?
No. Pure & Bloom is a natural cream deodorant. It is designed to manage odour while allowing you to sweat normally.

Sources: 1. Callewaert et al., "Mapping axillary microbiota responsible for body odours using a culture-independent approach," Microbiome (2014). 2. Callewaert et al., "Microbial Odor Profile of Polyester and Cotton Clothes after a Fitness Session," Applied and Environmental Microbiology (2014). 3. "The T-shirt microbiome is distinct between individuals and shaped by washing and fabric type," Microbiome/Applied Microbiology research (2020). 4. NHS: Body odour (BO).