Bags under the eyes are loose skin, subcutaneous tissue, muscles and orbital diaphragm of the lower eyelid, and fat behind the orbit is hypertrophy, forming a sagging protrusion, which is called bags under the eyes. Bags under the eyes are usually caused by fatigue or poor rest, or other factors. It is suggested to go to the local hospital for an examination now, find out the reason, pay attention to rest at ordinary times, avoid staying up late, and don't drink too much water before going to bed.