Swollen eyes of children may be caused by physiological factors, but also by eye infections, eye trauma, angioedema, kidney disease, etc., if the persistence of unrelieved recommended timely consultation. 1. Physiological factors: such as excessive fatigue, crying, too much sleep, sleep deprivation, etc., can cause eye swelling, usually after resting the symptoms can be relieved. 2. Eye infections: blepharitis, iridocyclitis, dacryoadenitis, etc., can be accompanied by red and swollen eyes, children can also be accompanied by eye itching, burning sensation, foreign body sensation, tearing, blurred vision and other symptoms. 3. Eye trauma: such as intraocular foreign body, eyelid abrasion or contusion, chemical burns, etc., can cause eye swelling, and children are often accompanied by obvious pain and local pressure. 4. Angioedema: also known as giant urticaria, in addition to eyelid edema, other loose parts can also have edema, such as lips, tongue, external genitalia, etc., some of the patients’ hands and feet extremities can also appear edema, pain is not obvious, can be accompanied by local itching, skin color changes and other symptoms. 5. Kidney disease: such as nephrotic syndrome, acute glomerulonephritis, etc., can have the manifestation of eyelid edema, and children are often accompanied by proteinuria, hematuria and other urinary changes. Children with swollen eyes, persistent unrelieved or with other discomfort, should seek medical attention, under the guidance of the doctor to identify the cause of the disease, and follow the doctor’s instructions for appropriate treatment.