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What Causes a Double Chin, and Which Type of Option Fits the Cause
Expert Insights

What Causes a Double Chin, and Which Type of Option Fits the Cause

What actually causes fullness under the chin, why prescription injectable options are a physician decision, and how non-surgical device options and surgery compare, so you can have a clearer conversation at an assessment.

April 20, 2026
Last updated October 15, 2026
Dr. Charles Jiang & RAAC Team
Medically reviewed by Dr. Charles Jiang
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This article is about diagnosis before treatment: what is actually causing fullness under your chin, and which type of option matches that cause. Fat, loose skin, neck muscle bands and jaw shape each point to different routes; prescription injectables are a physician decision, while device options such as CoolSculpting address fat only, and results vary. If you already know fat is the issue and want to see what a device plan, sessions and recovery look like, see Double chin treatment: sessions and recovery.

This article explains the causes and the main categories of options so you can have a clearer conversation at an assessment. It does not describe prescription products in detail.

What causes a double chin?

Fullness under the chin (doctors call it submental fullness) usually comes from one or more of these:

  • Fat above or below the neck muscle. Fat under the chin is partly genetic and does not always shrink with weight loss.
  • Loose skin that has lost elasticity with age or after weight change.
  • Muscle bands (the platysma) that become more visible over time.
  • Jaw and chin structure, such as a smaller or set-back chin, which can make the area look fuller even at a healthy weight.
  • Posture, which can make fullness more noticeable in photos.

Because the causes differ, two people with a similar-looking double chin may be suited to quite different options.

What are double chin injections?

"Double chin injections" usually refers to prescription injectable products intended to reduce a small, well-defined pocket of fat under the chin. They are prescription drugs, so they are not something to choose from a website. A physician decides whether such an option is medically suitable for a person after looking at the cause of the fullness, the skin, the neck anatomy and the person's health history, and explains the risks in that context.

If fat is not the main cause, an injectable designed for fat will not address loose skin or a set-back chin.

What non-surgical device options are there for the under-chin area?

At RAAC, under-chin fullness can be assessed for these device treatments:

  • CoolSculpting (cryolipolysis) cools a targeted area of fat. A smaller applicator is designed for the area under the chin. Temporary redness, numbness, tenderness and swelling are common afterwards, and changes develop gradually over the following weeks to months.
  • ONDA PRO uses focused microwave energy aimed at the fat layer, with a handpiece for the submental area. Temporary redness, warmth and tenderness can occur.
  • EMFACE combines radiofrequency heat with muscle stimulation and is used on the face and lower face. Whether it suits your concern is assessed in person.

If loose skin is the main issue, skin-tightening options such as Ultherapy or Thermage may be discussed instead of fat reduction.

How do the options compare?

Swipe left/right to view the full table
Prescription injectable optionsCryolipolysis (CoolSculpting)Microwave (ONDA PRO)Surgery (liposuction)
TypePrescription drug, physician decisionNon-invasive deviceNon-invasive deviceSurgical procedure
AddressesSmall pocket of fatFatFatFat, often with skin changes
Usual after-effectsDiscussed by the physicianRedness, numbness, tendernessRedness, warmth, tendernessBruising, swelling, recovery time
SessionsPhysician decidesOften more than oneOften more than oneUsually one

Every option has limits, and none of them changes the jaw structure or replaces healthy weight management.

Who is a good candidate for non-surgical chin contouring?

People who tend to suit device options are generally healthy adults with a modest amount of fat under the chin, reasonable skin elasticity and realistic expectations about gradual change. People with significant loose skin, a set-back chin, recent neck surgery or certain medical conditions may be better served by a different approach, and some will be advised that no treatment is needed.

Frequently Asked Questions

Can I get double chin injections at RAAC?

RAAC's options for the under-chin area are the device treatments described above. Whether any prescription option is appropriate for you is a separate medical decision to discuss with a physician.

Will losing weight get rid of a double chin?

Sometimes it helps, but under-chin fat is partly genetic, and loose skin or jaw shape do not change with weight loss.

How long do results from device treatments take to show?

Changes from fat-reduction devices usually develop gradually over weeks to a few months, and results vary.

How much does treatment cost?

Cost depends on the option and the number of sessions, and is explained at consultation after an assessment.

Is there downtime?

Most people resume normal activities the same day after device treatments; temporary redness, swelling or tenderness is possible.

If you live in Richmond or Greater Vancouver and want an assessment, you can book a consultation. Our team speaks English, Mandarin and Cantonese.

This article is general education and does not replace individual medical advice.

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Dr. Charles Jiang & RAAC Team

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