There are many reasons for children’s swollen eyes, such as physiological phenomena, such as drinking too much water, lack of sleep, etc. Pathological factors are mostly seen in the eye allergic diseases, eye infections. 1. Physiological reasons: if a child drinks too much water at one time, it can lead to the accumulation of water in the body, and then eyelid edema; in addition, sleep deprivation, sleeping position is not correct, can also appear in the eyes of the performance of the swelling. 2. Allergic diseases: If the child is allergic, after being stimulated by pollen, dust mites and other stimuli, causing an allergic reaction in the eyes, which can lead to localized redness and swelling of the eyes. In addition, mosquito bites can also lead to localized allergies, redness, swelling, erythema, blisters and so on. 3. Eye infections: common bacterial infections, such as blepharitis, dacryocystitis, dacryoadenitis, etc., can cause eye swelling, and can be combined with eye pain, swelling. Children with swollen eyes that cannot be relieved by rest for a long time or are accompanied by other obvious discomforts should go to the hospital in time and be treated under the guidance of the doctor.