Armpit Fat Causes + 10 Easy Moves To Eliminate It

Armpit fat (often called “accessory breast” or “armpit fat”) is a common concern for many women. It can appear regardless of bust size and is usually caused by fat from the breast shifting outward. When wearing tank tops or bikinis, the bulge around the armpit can look unflattering.

To improve this issue, it’s important to understand what causes it, choose the right bras, and practice simple exercises to sculpt a smoother chest line. Today, we’re sharing 10 beginner-friendly moves to reduce armpit fat—and if you want a natural lift for your cup size at the same time, don’t miss this guide!

1

What Is “Armpit Fat”?

In simple terms, it’s the extra fat that sticks out from the armpit, separate from the actual breast. If you notice a lump of fat bulging out when wearing bras, camisoles, or swimwear, that’s armpit fat.

It’s called an “accessory breast” because sometimes it can contain leftover glandular tissue. If not managed, it can look like you have “four breasts” when wearing fitted clothing!

2

Real vs. Fake Armpit Fat

Armpit fat can be divided into two types:

• True armpit fat: Caused by congenital misplacement of breast tissue. It may even contain glandular tissue or a regressed nipple. This type can swell or feel tender before menstruation.
• Pseudo armpit fat: Caused by lifestyle factors such as weight gain, poor bra support, or gravity. It’s essentially displaced breast fat that gathers near the armpit, which can distort the breast shape and lead to sagging or flattening.

3

Common Causes of Armpit Fat

Most cases are due to daily habits, especially wearing the wrong bra. Here are the main culprits:

1. Wearing the wrong bra size: Many women squeeze into smaller bras to create more cleavage, but this compresses breast fat, restricts circulation, and pushes fat toward the armpit over time.

2. Strapless bras for too long: Strapless bras lack proper support, leading to sagging and fat displacement. Their shallow cup coverage also allows fat to escape toward the armpit.

3. Incorrect bra wearing method: Even with the right size, mistakes like misadjusted straps, cups not covering fully, or back bands riding too high/low can all distort breast shape and encourage fat migration.

4

Say Goodbye to Armpit Fat: Choosing & Wearing Bras Correctly

Wearing and selecting bras properly is key to prevention.

How to wear a bra correctly:

1. Bend forward slightly, put on the straps, then fasten the back hook.
2. Use one hand to hold the bra edge, and the other to scoop any excess underarm fat into the cup.
3. Adjust straps so the back band sits straight below the shoulder blades. Finally, lift the breast upward with the underwire for a secure fit.

3 Key tips for choosing the right bra:

• High coverage: ¾-cup bras are ideal—they support without compressing and prevent fat displacement. Wider side wings also improve containment.
• U-shaped back straps: Provide better support, reduce back bulge, and prevent fat shifting outward.
• Breathable, stretchy fabric: Prevents discomfort in hot weather and maintains secure fit during movement.

What about shapewear bras?

Shapewear may temporarily push fat back into the cups, but once removed, the bulge reappears. Worse, constant compression can restrict circulation and even deform breast tissue. Long-term solutions come from habit changes and targeted exercises.

5

10 Beginner-Friendly Moves to Eliminate Armpit Fat

Strengthening chest and arm muscles not only reduces underarm fat but also improves bust shape. Try these simple moves at home:

1. Circle & Clap: Raise arms overhead, palms together. Circle arms outward, then return to the top and clap. Do 3 sets of 40 reps.
2. Elbow Circles: Bend elbows, fists near armpits, elbows aligned with shoulders. Rotate elbows backward in large circles.
3. Arm Swings: Bend arms to 90°, fists facing up. Keep upper arms still while swinging forearms up and down.
4. Chest Expansion Stretch: Press palms together in front of chest, inhale, then stretch arms backward, clasp hands behind, and feel chest open.
5. Eagle Arms: Hold right arm upright at chest, wrap left arm around it, palms pressed together. Raise slowly upward, then lower back to chest.
6. Kneeling Push-ups: Kneel with ankles crossed, hands shoulder-width apart. Lower chest by bending arms, keeping body straight, then push back up. Repeat 10 times.
7. Wing Flaps: Extend arms sideways, aligned with shoulders. Flap forward and backward like wings without moving the torso.
8. Arm Circles: Raise arms sideways, keep straight, and rotate forward/backward for 30 seconds each. Avoid shrugging shoulders.
9. Chest Squeeze (90°): Raise arms, bend elbows at 90°, squeeze arms forward until elbows touch, then open again.
10. Back Stretch: Clasp hands behind, keep back straight, then lift arms upward slowly to feel a stretch in chest and back.

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Editor’s Trial: Can One Treatment Really Lift the Bust Instantly? Trying Perfect Medical’s B6 Breast Enhancement Treatment!

I’d heard of Perfect Medical’s B6 Breast Enhancement Treatment before, but this was my very first time trying it. Like many women, I’ve always struggled with uneven cup size and armpit fat. I tried countless shaping bras, but the results were minimal. That’s why I finally decided to give this treatment a go!

When I arrived, the therapist was incredibly attentive. She explained the treatment process in detail and asked about my main concerns. I mentioned that my biggest issue was armpit fat. She reassured me, saying my case wasn’t too severe at all.

During the session, the therapist used a professional bust-care device to massage across my chest, with extra focus on the armpit area. It wasn’t painful—just a little redness on the skin, which faded quickly afterward. The surprising part? She handed me a mirror afterward, and I could clearly see that the armpit fat had shrunk! My bust shape also looked more lifted and centralized.

If you, like me, are troubled by armpit fat, I genuinely recommend trying Perfect Medical’s B6 Breast Enhancement Treatment—you might be amazed by the immediate improvement!