The larynx is a hollow, tube-shaped organ in your throat that sits between the back of your tongue and the top of your windpipe. Often called the voice box, it has three jobs: producing sound, protecting your airway when you swallow, and serving as the passageway for air moving in and out of your lungs. It’s built from a framework of cartilage, lined with muscle and soft tissue, and is roughly the size of a walnut in women or a small plum in men.
Where the Larynx Sits in Your Throat
The larynx connects two larger structures. Its upper end opens into the pharynx (the wider space at the back of your throat), and its lower end narrows into the trachea, the tube that carries air down to your lungs. You can feel part of it from the outside: the firm bump at the front of your neck, commonly called the Adam’s apple, is the largest piece of laryngeal cartilage pushing against the skin.
In adults, the larynx measures roughly 17 to 18 mm from front to back in men and about 15 mm in women. The subglottic area, the narrowest section just above where it meets the trachea, averages around 16 to 19 mm wide depending on sex. These dimensions matter because even small amounts of swelling in this tight space can noticeably affect breathing or voice quality.
The Cartilage Framework
Unlike most organs, the larynx holds its shape with cartilage rather than bone. The largest piece is the thyroid cartilage, the shield-shaped plate that forms the Adam’s apple. Below it sits the cricoid cartilage, a complete ring that acts as the structural base. Perched on top of the cricoid are two tiny pyramid-shaped cartilages called the arytenoids, which anchor the back ends of the vocal folds and allow them to open and close. Above everything, a leaf-shaped flap called the epiglottis is attached to the hyoid bone and hinges backward during swallowing to cover the airway opening.
How It Produces Your Voice
Voice production begins when small muscles pull the vocal folds (two bands of tissue stretching across the inside of the larynx) together, narrowing the gap between them. As your lungs push air upward, pressure builds below the closed folds. Once that pressure crosses a threshold, the folds are blown apart and then snap back together, repeating the cycle hundreds of times per second. Each open-close cycle releases a tiny puff of air, and the rapid series of puffs creates a sound wave.
The process is more complex than a simple vibration. Different layers of each vocal fold move at slightly different times, creating a ripple that travels from bottom to top, sometimes called a mucosal wave. This wave is essential because it allows airflow to do more work pushing the folds open than the folds do pushing back, sustaining vibration without conscious effort. If the tissue stiffens from scarring or swelling and the wave can’t form properly, the voice becomes breathy or rough.
Pitch depends on how tense and long the vocal folds are. One set of muscles tilts the thyroid cartilage forward, stretching the folds and raising pitch, while an opposing muscle inside the folds themselves shortens and relaxes them, lowering pitch. Volume comes from pushing more air pressure beneath the folds, which makes them slam together with greater force.
How It Protects Your Airway
Every time you swallow, the larynx has to seal itself off so food and liquid enter your esophagus instead of your lungs. Three things happen almost simultaneously: the vocal folds snap shut (glottal closure), the epiglottis folds down over the opening like a trap door (epiglottal descent), and the entire larynx lifts upward and forward in your neck. Of these, glottal closure is the primary safeguard. You can actually feel the larynx rise if you place your fingers lightly on your Adam’s apple and swallow.
When this system misfires, food or liquid slips past the vocal folds and enters the trachea, a problem called aspiration. This triggers the cough reflex, but in people with weakened laryngeal muscles or nerve damage, even the cough may not be strong enough to clear the airway.
Changes During Puberty
The larynx grows in both sexes during puberty, but testosterone drives far more dramatic changes in males. Androgen receptors in the vocal fold tissue respond to rising testosterone levels, causing the folds to lengthen and thicken significantly. The larynx itself enlarges and descends slightly lower in the neck, a feature unique to males sometimes called the secondary descent of the larynx. This is why the Adam’s apple becomes more prominent in teenage boys and why the male voice drops roughly an octave, while the female voice drops only a few notes.
Common Conditions That Affect the Larynx
Voice disorders affect an estimated 1.3 to 1.7 percent of the U.S. population, and that number has been rising. The pattern shifts with age: younger people are more likely to develop acute laryngitis (short-term inflammation, usually from a cold or overuse), while older adults face higher rates of more serious problems like vocal fold paralysis or laryngeal cancer.
Occupation plays a role too. People who use their voice heavily, such as teachers, singers, and service workers, are more prone to benign growths like nodules and polyps on the vocal folds. Manufacturing workers, likely due to chemical and particulate exposure, have a higher rate of laryngeal cancer than the general population.
Laryngeal Cancer
About 12,290 new cases of laryngeal cancer are expected in the United States in 2026, with an estimated 3,960 deaths. The overall five-year survival rate is 62.5 percent, but prognosis depends heavily on how early the cancer is caught. When the cancer is still confined to the larynx (about 49 percent of cases at diagnosis), the five-year survival rate is nearly 80 percent. Once it spreads to nearby lymph nodes, that drops to roughly 49 percent, and if it reaches distant organs, survival falls to 36 percent. Persistent hoarseness lasting more than two or three weeks is the most common early warning sign, which is why unexplained voice changes in adults warrant a closer look.
How Doctors Examine the Larynx
Because the larynx sits deep in the throat, it can’t be examined with a standard physical exam. The most common method is flexible laryngoscopy: a thin, flexible scope with a tiny camera is threaded through your nose after the area is numbed with a spray. The whole process takes only a few minutes and happens in a regular office visit, not an operating room. An older technique uses a small angled mirror held at the back of the throat (indirect laryngoscopy), though this approach is much less common today. For more detailed evaluation, especially of vocal fold vibration patterns, doctors may use stroboscopy, which flashes a light in sync with fold vibration to create a slow-motion view of the mucosal wave.