Under-eye bags are puffy areas that appear beneath the eyes, often giving a tired or aged appearance. They can be caused by various factors, including lack of sleep, aging, and fluid retention. Genetics also play a role, as some people are more prone to developing these bags than others. Lifestyle choices, such as diet and hydration, can influence the severity of under-eye bags. Allergies and sinus issues may contribute to puffiness as well. While they are usually harmless, many seek treatments like creams or cosmetic procedures to reduce their appearance and achieve a more refreshed look.