A double chin, or submental fat, is a common cosmetic concern characterised by a layer of fat beneath the chin. It can result from various factors, including weight gain, genetics, ageing, and poor posture. As people age, skin loses its elasticity, and muscles weaken, which can contribute to the appearance of a double chin. Additionally, fluid retention and hormonal changes can also play a role. While a double chin is often associated with being overweight, even those at a healthy weight may develop one due to genetic predisposition. Treatments to reduce a double chin range from lifestyle changes, such as diet and exercise, to non-invasive procedures.