Swelling and pain under the eyes may be caused by poor work and rest, as well as blepharitis and cellulitis. 1. Poor work and rest: if the patient every night before going to bed for a long time to look at the phone, read the computer often stay up late, resulting in lack of sleep, poor blood circulation, may cause the patient bags under the eyes swelling, pain. 2. Blepharitis: Blepharitis is an acute suppurative inflammatory lesion that may cause redness, swelling, pain, and fever in the affected area, and in severe cases, localized nodules or ulceration and pus flow. 3. Cellulitis: Cellulitis is a suppurative reaction caused by infected bacteria, and the patient’s skin tissues and fascial tissues, including around the eyelids, may appear redness, swelling, pain, fever and other symptoms. It is recommended that patients with swollen and painful bags under the eyes should consult a doctor to assess their condition and follow the doctor’s instructions for treatment.