Swollen eyes in an 11-year-old girl may be caused by long crying or poor sleeping habits, trauma or allergies. 1. Longer crying time: If the child cries for a longer period of time and frequently rubs her eyes when she cries, it may lead to swelling of both eyes; 2. Poor sleeping habits: If your child has poor sleeping habits, such as staying up late often, not getting enough sleep, or drinking too much water before going to bed, it may also lead to puffy eyes; 3. trauma: if the child’s eyelids are traumatized, it will increase the permeability of blood vessels, so there will be swelling of both eyes, usually with pain and bleeding; 4. Allergy: if the child is allergic to certain substances, contact dermatitis can occur after contact with these substances. Swelling of both eyes in an 11-year-old girl may also be caused by other reasons, such as acute inflammation of the eyelids, blood circulation disorders, etc., the specific need to go to the regular hospital to consult, clarify the cause, and then targeted treatment.