Large bags under the eyes may be caused by excessive use of the eyes, older age or excess fat. 1. Excessive eye use: In daily life, if you use your eyes excessively, the elasticity of the eye muscles may be reduced, and large bags under the eyes may occur. 2. Age and heredity: As age rises, the support structure of the eyelid area loosens, and due to gravity, the fat in the orbital septum bulges out and downward, resulting in the appearance of large bags under the eyes and looser skin. Some people also have bags under the eyes when they are young due to hereditary factors. 3. Excess fat: If there is too much fat, bags under the eyes may also appear, due to excess fat, resulting in reduced skin elasticity, fat displacement and sagging. If there are bags under the eyes, it is recommended to improve lifestyle habits, discomfort, timely medical treatment, and intervention as prescribed by the doctor.