A double chin is a layer of excess fat beneath the chin that creates a soft fullness or fold between the jawline and the neck. The medical term is submental fullness, and it’s one of the most common cosmetic concerns for both men and women. While many people associate it with weight gain, a double chin can appear in people at any weight due to genetics, aging, or the underlying structure of their jaw and neck.
What Causes a Double Chin
Three factors drive the formation of submental fullness: genetics, aging, and weight gain. For many people, more than one of these is at play simultaneously.
Genetics is often the biggest factor. The way your body distributes fat is largely inherited, and some people are simply predisposed to store more fat around the jaw and neck. You can be at a healthy weight and still carry noticeable fullness under the chin because of how your particular body is built. Bone structure matters too. A smaller or more recessed chin provides less structural support for the overlying skin and fat, which makes submental fullness more visible even when the actual amount of fat is modest.
Aging plays a significant and compounding role. Starting in your mid-20s, your skin’s collagen production drops by roughly 1% to 1.5% per year. Over four decades, that adds up to about a 25% decrease in total collagen. As collagen and elastin fibers thin out and become disorganized, skin loses its firmness and begins to sag. In the neck, this means the skin gradually drapes downward, and the muscle beneath it (called the platysma) can loosen and develop visible bands. Even without gaining weight, these changes can create or worsen the appearance of a double chin over time.
Weight gain adds fat to the submental area just as it does elsewhere in the body. But because the space between the chin and neck is relatively small, even a few extra pounds can show up prominently there.
How Posture Plays a Role
Hours spent looking down at a phone or hunching over a laptop can make a double chin more noticeable, even if the underlying fat hasn’t changed. A forward head posture shortens and tightens the muscles at the back of the neck while stretching and weakening those in front. Over time, this imbalance shifts the resting position of your head and jaw in ways that compress the tissue under your chin. The fullness you see in a video call may partly be postural rather than purely anatomical.
Can Exercise or Diet Get Rid of It
You cannot target fat loss to a specific body part. This is one of the most persistent fitness myths, and research has consistently debunked it. A 2021 meta-analysis of 13 studies with over 1,100 participants found that exercising a specific area of the body had no effect on fat deposits in that area. Chin exercises and jaw workouts you see promoted online may strengthen the small muscles around your jaw, but they won’t selectively burn the fat sitting on top of them.
That said, overall weight loss does reduce submental fat along with fat elsewhere. If your double chin is partly related to weight, losing body fat through a calorie deficit will eventually reduce it. You just can’t control the order in which your body draws from its fat stores. Some people lose chin fat early in their weight loss journey, while others find it’s among the last places to slim down.
Non-Surgical Treatment Options
For people who want to reduce a double chin without surgery, two main approaches exist: injectable fat dissolvers and fat freezing.
The FDA-approved injectable treatment uses a synthetic version of a bile acid that your body naturally produces to break down dietary fat. When injected into the fat layer beneath the chin, it destroys fat cells permanently. The typical course involves up to six treatment sessions spaced one month apart. In clinical trials, about 68% to 70% of treated patients achieved at least a one-grade improvement in chin fullness (compared to roughly 20% with placebo). A more dramatic two-grade improvement occurred in 13% to 18% of patients. Results are permanent because destroyed fat cells don’t regenerate, but the treatment area commonly swells, bruises, and feels numb for days to weeks afterward. Less common side effects include difficulty swallowing and temporary facial muscle weakness.
Fat freezing (cryolipolysis) uses controlled cooling to kill fat cells through the skin. For the submental area, studies show an average fat volume reduction of about 20% at 12 weeks, with 88% of patients reporting satisfaction with their results. It’s generally less invasive than injections, though it typically requires fewer sessions.
When Surgery Makes More Sense
Non-surgical options work best when the problem is primarily excess fat in someone with firm, elastic skin. Once loose skin or muscle laxity enters the picture, especially in older patients, the calculus changes.
Liposuction of the chin area removes fat through a small incision and works well for younger patients whose skin can contract and re-drape smoothly after the fat is gone. But research comparing liposuction alone to more comprehensive surgical approaches has found that isolated liposuction only addresses one piece of the problem. For most patients, the fullness under the chin involves not just fat but also loosened muscles and excess skin.
A neck lift combines fat removal with tightening of the platysma muscle (platysmaplasty) and, when needed, removal of excess skin (cervicoplasty). This is considered the more complete procedure because it addresses all three contributors: fat, muscle laxity, and skin sagging. The tradeoff is a longer recovery and more visible incisions. Younger patients with good skin elasticity and an isolated pocket of fat may do well with liposuction alone, while those with age-related changes generally get better results from a full neck lift.
Why Some Double Chins Are Harder to Treat
The underlying cause shapes what will actually work. A genetically determined fat pad in a 30-year-old with tight skin responds well to almost any fat-reduction method. A double chin in a 60-year-old, driven largely by collagen loss and muscle banding, won’t improve much from fat removal alone because the skin has lost its ability to snap back. Treating it effectively means addressing the skin and muscle, not just the fat.
Airway positioning and jaw structure also matter. Some people have a naturally shorter distance between the chin bone and the Adam’s apple, which leaves less vertical space for tissue to spread out. In these cases, even small amounts of fat or mild skin laxity look more prominent. A recessed chin can be augmented with an implant or filler to create a stronger visual separation between the jaw and neck, sometimes reducing the appearance of a double chin without touching the fat at all.