Why Do My Armpits Smell? A Tween & Teen Guide to Body Odor, Sweat and Deodorant
So... your armpits smell now.
Maybe you noticed it after PE.
Maybe after practice.
Maybe you took off your hoodie at the end of the day and thought:
Wait. Is that me?
Yep. Maybe.
And before you start spiraling, here's the most important thing to know:
Body odor is completely normal.
It happens to basically everyone as their body starts changing.
You aren't dirty.
You aren't doing anything wrong.
And no, you're definitely not the only person at school wondering why deodorant suddenly became necessary.
Welcome to the club.
Why do I suddenly have body odor?
Your body changes as you get older.
During puberty, some of your sweat glands become more active. Sweat, natural oils, and bacteria that already live on your skin can combine and create the smell we call body odor.
That's why your armpits might smell totally different now than they did a couple of years ago.
The American Academy of Pediatrics says new body odor is a normal part of puberty and can start during the tween years.
So if you suddenly need deodorant?
That's normal too.
Why does my sweat smell bad?
Here's something weird:
Sweat itself isn't necessarily the thing that smells.
Your skin naturally has bacteria on it. When sweat and oils mix with those bacteria, odor can develop.
And your armpits happen to be one of the places where this happens a lot.
That is why washing your underarms and using deodorant can help.
It is less about trying to stop your body from being a body and more about managing what naturally happens throughout the day.
Am I supposed to smell different during puberty?
You might.
Puberty can change a lot of things.
You may notice:
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More sweating
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Underarm odor
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Oilier skin
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Different-smelling hair or scalp
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Body hair
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Acne
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Changes in how often you want to shower
Not everyone notices the same things at the same time.
One friend might start wearing deodorant at 9 or 10.
Someone else might not need it until later.
There is no perfect schedule your body is supposed to follow.
What age am I supposed to start using deodorant?
There isn't one.
Seriously.
Nemours KidsHealth says there is no set age when someone has to start wearing deodorant. It usually becomes useful when body odor begins.
So instead of asking:
“Am I old enough for deodorant?”
A better question is:
“Do I want help managing body odor?”
If the answer is yes, deodorant might be useful.
Is it weird if I need deodorant at 9 or 10?
No.
Body odor can start around the beginning of puberty, and that timing is different for everyone.
Some people notice it earlier.
Some notice it later.
Needing deodorant does not mean you're growing up “too fast.”
It just means your body is changing.
If you're worried because changes seem to be happening much earlier than they are for other people your age, you can always tell a parent, guardian, doctor, or another trusted adult.
You don't have to figure everything out by yourself.
How do I know if I smell?
This is possibly the most stressful part.
Sometimes you'll notice it yourself.
Sometimes you'll smell it when you take off a shirt.
Sometimes you'll notice it after sports.
And sometimes you might not notice because you've been around your own smell all day.
That's one reason deodorant works better as a routine than something you only use after thinking:
“Oh no.”
Once body odor starts, applying deodorant regularly can simply become part of getting ready.
Why do I still smell even though I shower?
First: showering does not permanently turn off sweating.
You can shower in the morning and still sweat later.
Your body is supposed to do that.
But if odor seems to come back really quickly, check a few things.
Are you actually washing your armpits with soap?
Did you put on a clean shirt?
Is the hoodie you're wearing actually clean?
Did you just have PE?
Did you use deodorant?
Was that soccer jersey sitting in your gym bag since Tuesday?
Sometimes the mystery is not much of a mystery.
Wait... I actually have to wash my armpits?
Yes.
Standing underneath shower water does not always do the job.
Actually wash your underarms with soap and water.
The American Academy of Pediatrics recommends paying extra attention to areas where sweat and odor collect, including the armpits and feet.
And while we're here:
Yes, wash your feet too.
You're welcome.
Why do I smell so much after PE or sports?
Because you're sweating more.
Running, dancing, volleyball, soccer, basketball, football, cheer, gymnastics, track, tennis, skating—or basically anything that gets your body moving—can make you sweat.
That's normal.
What helps afterward?
Change out of sweaty clothes when you can.
Shower after really sweaty activities.
Wash your sports clothes.
Use deodorant as directed.
And maybe don't leave damp socks inside a zipped gym bag for three days.
Your future self will appreciate it.
Can my clothes be making me smell?
Absolutely.
You can be freshly showered and still smell if you put sweaty clothes back on.
That includes:
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Shirts
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Hoodies
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Sports uniforms
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Bras or undershirts
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Socks
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Pajamas
Clothes can hold onto sweat and odor.
Clean body + not-clean hoodie = mystery solved.
What does deodorant actually do?
Deodorant helps manage body odor.
It does not necessarily stop you from sweating.
That distinction matters.
Sweating is normal.
Your body actually uses sweat to help cool itself down.
A deodorant helps with odor.
An antiperspirant is designed to reduce how much you sweat.
They are not exactly the same product.
Do I need deodorant or antiperspirant?
It depends on what bothers you.
If your main thought is:
“My armpits smell.”
You might want deodorant.
If your main concern is:
“I sweat a lot and want to reduce it.”
You may want to learn more about antiperspirant.
Some products do both.
There is no prize for choosing one type over another.
It's about what works for you.
Is sweating bad?
No.
Sweating is normal.
You sweat when you're hot.
You sweat when you exercise.
You might sweat when you're nervous.
And puberty can make sweating more noticeable.
You do not need to be embarrassed because your body sweats.
However, if you're sweating so much that it's making everyday life difficult—or you're sweating heavily even when you're not hot or active—tell a trusted adult or healthcare professional. Excessive sweating can sometimes be something a doctor can help with.
How often should I shower if I have body odor?
There isn't one perfect rule for everyone.
But once body odor starts, regular showering becomes more important.
You may especially want to shower after:
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Sports
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Heavy sweating
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Very hot days
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Workouts
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Activities where you've been moving a lot
Nemours KidsHealth recommends regular bathing and showering after a lot of sweating as part of managing body odor.
Your routine might change depending on what you did that day.
What deodorant should I use?
There isn't one deodorant that's perfect for everybody.
Think about what matters to you.
Maybe you want something that:
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Smells good
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Doesn't smell too strong
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Goes on smoothly
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Is baking-soda-free
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Has been tested for sensitive skin
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Doesn't feel childish
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Looks like something you'd actually want in your bathroom or backpack
You may need to try more than one before finding something you really like.
That's normal too.
What if deodorant makes my armpits itchy?
Stop using it if you're getting persistent redness, itching, burning, or irritation.
That is not something you need to “push through.”
Nemours KidsHealth recommends stopping a deodorant if it causes irritated or itchy skin and telling a parent or trusted adult so you can find another option.
Different people react differently to ingredients and fragrances.
A product your friend loves might not be your favorite.
That's okay.
Is baking soda in deodorant?
Sometimes.
Baking soda—also called sodium bicarbonate—is an ingredient found in some natural deodorants.
But not every natural deodorant uses it.
Some people specifically look for baking-soda-free deodorant based on how different formulas feel on their skin or simply because that's what they prefer.
Siiiba deodorant is baking-soda-free.
What's Siiiba?
Hi. That's us.
Siiiba is a natural, baking-soda-free deodorant brand created with youths, tweens, and growing teens in mind.
Siiiba deodorants are dermatologist tested, clinically tested, and have completed sensitive-skin testing.
But honestly?
The bigger reason Siiiba exists is because personal care for people your age shouldn't feel like it was designed for a toddler.
And it shouldn't feel like you suddenly have to become an adult either.
There should be something in between.
Is Siiiba deodorant for kids?
This is where wording gets weird.
People might search for:
“deodorant for kids”
“deodorant for 10-year-olds”
“best deodorant for teens”
“tween deodorant”
or basically anything else.
But Siiiba thinks of the people using its products as youths, tweens, and teens.
You're growing.
You're developing your own taste.
You're becoming more independent.
You deserve products that understand that.
Is Siiiba natural deodorant?
Yes.
Siiiba is a natural deodorant and is baking-soda-free.
It is a deodorant rather than an antiperspirant, so it focuses on odor management instead of preventing normal sweating.
Is Siiiba good for sensitive skin?
Siiiba's tested deodorants have completed sensitive-skin HRIPT testing with 50 subjects per tested scent.
They have also completed testing supporting the claims:
Dermatologist Tested
Clinically Tested
That doesn't mean any product can promise that every single person will react exactly the same way.
Your skin is your skin.
If anything you use causes irritation, stop using it and tell a trusted adult.
What if I don't want a deodorant that smells super strong?
You don't have to use one.
Fragrance is personal.
You may want:
Something fresh.
Something subtle.
Something more noticeable.
Or something unscented.
There is no correct deodorant personality.
Pick the experience that feels most like you.
What if I'm embarrassed to ask my parents for deodorant?
We get it.
You could keep it incredibly simple:
“Can we get deodorant next time we're at the store?”
That's enough.
You don't need to present evidence.
You don't need to announce that you think you smell.
And you definitely don't need to turn it into a huge conversation unless you want to.
Chances are, the adult you're asking has been expecting this moment eventually.
They went through puberty too.
Yes, even them.
What if someone tells me I smell?
First of all:
Ouch.
That's not a fun thing to hear.
But body odor is something you can manage.
It does not say anything about who you are.
Take a shower.
Put on clean clothes.
Use deodorant.
Wash that hoodie.
Problem-solve.
Then move on.
Everyone has had an awkward body moment.
Probably more than one.
What if I'm scared other people can smell me?
Once you know body odor has started, having a routine can make you feel much more confident.
Something as simple as:
Shower → clean clothes → deodorant → go live your life
can remove a lot of the guessing.
You can also keep deodorant in your sports bag if you need it.
The goal isn't to spend the entire day worrying about whether you smell.
The goal is actually the opposite.
Create the routine so you don't have to think about it so much.
Do other people my age deal with this too?
Yes.
Absolutely.
Body odor is one of the most normal parts of puberty.
The person sitting next to you in math class?
Probably figuring out some version of this too.
The teammate next to you?
Same.
The person who seems completely unbothered by puberty?
We promise their body is doing weird things too.
Everyone grows differently.
Nobody skips growing up.
Is body odor something I should be embarrassed about?
No.
Body odor is not a personality trait.
It doesn't mean you're dirty.
It doesn't mean you're gross.
It doesn't mean everyone around you is secretly thinking about it.
It means you have a human body.
Bodies sweat.
Bodies smell sometimes.
And as you get older, you learn how to take care of yours.
That's it.
When should I tell an adult about body odor or sweating?
Most body odor during puberty is normal.
But you should talk to a parent, guardian, doctor, school nurse, or another trusted adult if:
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You're sweating so much that it's interfering with everyday life
-
Your skin is painful or irritated
-
You have a rash that isn't going away
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Your body odor seems unusually strong even after washing and changing clothes
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You're worried about changes happening to your body
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You simply have questions
You are allowed to ask.
Nobody expects you to already know everything about growing up.
Your body isn't being weird. It's growing.
There are going to be new things.
Sweat.
Body odor.
Hair.
Skin changes.
Growth spurts.
Maybe some truly questionable voice cracks.
Welcome to being human.
You don't need to be embarrassed by any of it.
Learn what your body needs.
Find products you actually like.
Build a routine.
Ask questions when you have them.
And then get back to everything else you care about.
Siiiba is a natural, baking-soda-free deodorant created for youths, tweens, and teens navigating this exact stage of growing up. Its deodorants are dermatologist tested, clinically tested, and have completed sensitive-skin testing.
Your body is changing.
Don't make it weird.