Blepharitis, cellulitis of the eyelid, eye trauma, etc. may be the cause of the swelling and pain of the bags under the eyes. 1. Blepharitis: Blepharitis is a purulent inflammation of the glands of the eyelids, and the patient’s eyelids may be red, swollen, painful and uncomfortable, so the patient may have swollen and painful bags under the eyes. 2. Eyelid cellulitis: Eyelid cellulitis is an inflammatory disease of the eyelid infected by bacteria and other germs, which can cause redness, swelling and pain in the skin around the eyelid, so patients can experience the discomfort of swollen and painful bags under the eyes. 3. Eye trauma: If the patient’s eyes are contused or hit by eye trauma, it can lead to rupture of local subcutaneous small blood vessels and cause eyelid hematoma, and then the patient can experience bruising, swelling and pain in the bags under the eyes. It is recommended that patients with obvious swelling and pain under the eyes should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.