Hello, bags under the eyes are swelling of the lower eyelids. Because the eyelid skin is very thin and the subcutaneous tissue is thin and loose, edema is prone to occur. Heredity is an important factor, which becomes more obvious with age. In addition, kidney disease, pregnancy, lack of sleep or fatigue can cause fluid accumulation in the eyes to form eye bags. This phenomenon can easily make people look old and haggard. In order to avoid eye bags, you must first find out the cause and then prescribe the right medicine. If it is caused by a disease, it should be treated.