Swelling of the patient’s eyelids with pain may be caused by eye trauma, blepharitis, allergy and other reasons. 1. Eye trauma: If the patient’s eye suffers from trauma or impact, the local tissue of the eye is damaged, and the patient may experience local tissue congestion, swelling and pain in the eye. 2. Blepharitis: Blepharitis refers to suppurative inflammation of the eyelid glands. Under the stimulation of inflammation, patients may experience discomfort such as redness, swelling, heat and pain in the eyelids. 3. Eye allergy: If allergic children accidentally come into contact with cosmetics, shampoos, medications and other allergens, resulting in an allergic reaction in the eyes, patients may experience eye swelling, pain and other discomfort. It is recommended that patients with obvious redness and swelling of the eyelids should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.