The Adam’s apple is the front edge of your thyroid cartilage, the largest piece of cartilage in your larynx (voice box). Its primary job is structural: it protects the vocal folds and other delicate tissues inside the larynx, and it serves as an anchor point that directly controls your voice pitch. Everyone has one, but it’s far more visible in most men than in most women due to hormonal differences during puberty.
How It Protects Your Voice Box
The thyroid cartilage wraps around the front and sides of the larynx like a shield. Inside, your vocal folds attach right at the point where the cartilage comes together in the front, a spot anatomists call the thyroid notch. This means the Adam’s apple isn’t just a bump on your neck. It’s the outer surface of the structure holding your vocal folds in place.
Without this rigid cartilage, the soft tissues responsible for breathing, swallowing, and speaking would be exposed and vulnerable to injury. The cartilage keeps everything positioned correctly so your airway stays open and your vocal folds can vibrate properly.
Its Role in Controlling Pitch
The thyroid cartilage does more than sit there. It’s hinged so it can tilt slightly forward and downward. When muscles pull the cartilage in that direction, they stretch the vocal folds longer and tighter. Tighter folds vibrate faster, which raises the pitch of your voice. When the cartilage relaxes back, the folds loosen, and your pitch drops.
This is why you can feel your Adam’s apple move when you sing from a low note to a high one. That physical movement is the cartilage rocking on its hinge to change the tension on your vocal folds in real time. It’s a surprisingly mechanical process: longer, tighter folds produce higher sounds, shorter and looser folds produce lower ones.
Why It’s Bigger in Men
During puberty, testosterone causes the larynx to grow significantly. The cartilage expands, the vocal folds lengthen and thicken, and the entire larynx descends in the neck by roughly one vertebra’s distance compared to its position in females. All of these changes combine to produce a deeper voice.
The angle of the thyroid cartilage also changes. In adult men, the two plates of cartilage meet at the front at an average angle of about 76 degrees, forming a sharper, more pointed ridge. In adult women, that angle is closer to 94 degrees, creating a flatter, less visible profile. A sharper angle means a more prominent bump.
The result is a direct physical relationship: men with a larger, more visible Adam’s apple tend to have longer vocal folds, wider necks, and lower-pitched voices. Research measuring neck circumference at the level of the Adam’s apple found a clear negative correlation with voice pitch. Bigger larynx, lower voice.
Do Women Have One?
Every person has a thyroid cartilage, so technically everyone has an Adam’s apple. The difference is visibility. A study of 79 adults found the median size of the prominence was 0.16 millimeters in males and effectively zero in females. But about 22% of the women in the study did have a measurable, visible bump. Factors like overall body fat, neck thickness, hormone levels, and simple genetic variation in cartilage size all influence how prominent it appears. A thinner neck with less surrounding tissue will make any amount of cartilage more noticeable.
The Evolutionary Angle
Biologists view the Adam’s apple as a secondary sexual characteristic, similar to facial hair or broader shoulders. The deeper voice it helps produce may have played a role in signaling physical maturity and body size. Because the larynx grows outward from the neck without interfering with other structures, it’s a trait that could become exaggerated over evolutionary time without creating functional problems.
The voice changes tied to laryngeal growth are driven almost entirely by sex hormones during puberty. Both testosterone and estrogen shape the larynx differently, leading to the vocal and visual differences between adult men and women. This dimorphism, where one sex develops a trait more dramatically than the other, is a hallmark of traits shaped by sexual selection.
Surgical Reduction
Some people choose to have the prominence reduced through a procedure commonly called a tracheal shave (formally, chondrolaryngoplasty). This is most often sought by transgender women who experience distress from the visible bump contributing to being misgendered. The surgery shaves down the protruding cartilage to create a flatter neck profile. Because the vocal folds attach just behind the prominence, the procedure requires precision to reshape the cartilage without affecting voice quality.