Swollen bags under the eyes of children may be caused by physiological factors or pathologic factors, including acute nephritis, eye allergies and so on. 1. Physiological factors: children’s eyes for a long time, insufficient rest, crying, etc., affecting the blood circulation of the eyes, will cause children’s eye bags. 2. Acute nephritis: it is caused by various bacteria or viruses, which cause a series of immune reactions after infection of the human body, and the immune substances produced by the body will lead to acute inflammatory damage of the glomerulus, resulting in the symptoms of swollen bags under the eyes of children. 3. Eye allergy: if the children are allergic, before going to bed, on the duvet cover, pillow material allergies or mosquito bites after an allergic reaction, will also cause the children’s eye bags swollen symptoms. Children with swollen eyes may have other reasons, in the exclusion of physiological factors should be timely consultation, to identify the specific causes, and then follow the doctor’s instructions for treatment, usually pay attention to rest, maintain a regular work and rest.