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Why is my bra digging into my armpit?

Author

Daniel Moore

Published Jan 22, 2026

If the underwire is poking into your breasts, the cup size is too small. If the underwire is poking into your armpits, the cup size is too big or you're wearing the wrong style. The general rule of thumb: The underwire should never touch your breasts.

Why does my bra dig in under my armpits?

If your underwire is too small it will be digging into your breast tissue. If it's too large the underwire will sit too far outside of the breast tissue or there may be a gap underneath the breasts. This is why it's crucial to be wearing the right size bra.

How do I stop my bra from rubbing under my arms?

Wear Breathable Fabrics

Like all chafing, arm and side boob chafing are caused by a combination of sweat and friction from the skin rubbing together, so one of the best ways to prevent that area from rubbing is to wear a layer of soft, breathable fabric.

How do I stop rubbing under my breasts?

The most effective treatment for under-breast soreness is to follow this advice: • Wash the affected area morning and night. Pat dry, rather than rub dry. Wear good, supportive bras (cotton is known to be effective). This will help stop the 'skin to skin' rubbing.

How do I know if my bra cup is too big?

There's a gap at the top of the cups.

When you look down at your bra do you notice space between your breasts and the cup? If so, it's too big. If you aren't able to see any gaps while standing up, try leaning over while looking into a mirror. If there is extra space in your cups it's time for a new size.

22 related questions found

Why do my breasts fall out of the bottom of my bra?

Your breast tissue spills out of the bottom and sides of your bra for one of two reasons: you're either wearing the wrong cup size, or you're wearing the wrong bra style for your breast shape. Very often, it's simply a matter of the cups being too small.

How high should your breasts be?

According to my plastic surgeon (who did my breast reduction operation) the bust peak/nipple is supposed to sit at the mid-point between shoulders and elbows. Yet for many, this is not how it goes. Yours may sit higher or lower (anyone with a large bust will find theirs is likely to sit lower).

How many bras should you own?

As a general rule of thumb, it's important to have a healthy rotation of bras at the ready so that you're never left blindsided — and bare chested. All things considered, we'd suggest owning 11 bras in total in a couple of distinctive styles that range from everyday to on-occasion.

Why does my bra get tighter as the day goes on?

It could be down to hormonal changes

Throughout the day, you may find that they affect all manner of things. Often enough, an increase in hormones could mean that your breasts swell or start to feel larger. That is typically completely normal but it can play havoc with your lingerie.

Should new bras feel tight?

Band feels a little snug or tight

This is normal. You want the band to feel snug and not move on the loosest set of hooks and your bra will stretch out with time and wear. Did you know you get your support from your band? Yes, in order to hold up your bosoms, your band needs to fit low and snug on your back.

How do you stretch out a bra?

Soften up a bra by hand washing it a few times before you wear it. Hand washing , or a cool wash if you must use a washing machine, will help to soften up the fabric and make it a more comfortable fit. Have a look at this video to see how to hand wash your bra properly.

How do you know if your bra is too small for you?

If the breast spills out over the edge of the cup forming an extra 'bulge', sometimes called a 'double breast', the cup is too small for your bust. The breast shouldn't swell up between the shoulder straps or towards the armpit. You may need to go up several cup sizes to fix this.

Should you wash a bra before wearing it?

Yes! You should definitely wash your new bras before wearing them. Of course, looking back, you'll likely remember many times that you purchased some new bras and put them on right away without suffering any consequences.

How long will a bra last?

Even with gentle usage and care, all bras will lose their shape over time as the elastic fibres in the band and straps begins to deteriorate. It's generally recommended that a bra should last anywhere between 6-9 months, although we think that with good care your bras should last a lot longer.

How often should I wash my bras?

How often you need to wash your bras isn't an exact science. But dermatologist Alok Vij, MD, says that as a general rule, you should wash them after every two to three wears.

What is the smallest bra size?

Generally, the A cup is considered the smallest available but for some this is still too big and compensating with a smaller band size won't help. If you want something that's going to fit your form you'll have to go down a level to an AA or even AAA cup.

What is the average bra size for 20 year old?

Twenty years later, the average bra cup size is a 34DD, a quite substantial increase of three cup sizes. In addition, major bra manufacturers are reporting a surge in the number of much larger bras that women are buying – 38 to 40 and greater as well as cup sizes of G, H and larger.

What is the average bra size for 18 year old?

Mostly girls on 18 (and about your height) usually own around 32–34 (may exists between 'B' to 'D' cup). In few cases teens have bigger/smaller, if inherited, or she is heavy/low weighted.

Why do I spill out of my bra?

If your breasts are spilling out of the bra cup, you're not wearing the correct size. Similar to side overflow, cup overflow is easy to fix: trade-in for a bigger cup size and give your breasts some much-needed breathing room! If you're a 34B, trade up a half-size to 34B ½ or a whole cup size to 34C if you need it.

Why do bra straps fall off shoulders?

4 Main Reasons Why Your Bra Straps Keep Falling Down

The straps are not adjusted properly. You are wearing a bra with an incorrect cup or band size. You are wearing a bra style that isn't suit to your figure. The bra has aged and lost its elasticity within its straps.

What can I use for sweat under breast?

Best anti-perspirants for stopping underboob sweat

  • Dove Advanced Care Sensitive 48-Hour Anti-perspirant Deodorant Stick. ...
  • Dove Invisible Dry Spray Sheer Fresh Anti-perspirant. ...
  • SweatBlock Anti-perspirant Wipes, 10 Count. ...
  • Body Glide. ...
  • Gold Bond Friction Defense Stick. ...
  • Desitin Daily Defense Baby Diaper Rash Cream.

What does breast chafing look like?

A heat rash can pop up when the sweat ducts beneath your breasts are blocked, trapping in perspiration. The result is clear, fluid-filled blisters and bumps; itchy, prickling red bumps; or goose bump–like areas on your skin.

Why do I sweat between my breast?

“When skin touches skin, it can occlude or block the skin from allowing sweat to evaporate, leading to increased moisture. This is very common in the breast area, either between the breasts or under the breasts,” says Dr. Anna Guanche, a dermatologist and beauty expert.