Children with blue bags under the eyes may be caused by non-disease factors such as heredity and poor sleep, or they may be caused by pathologic factors such as trauma, allergic diseases, and other diseases. 1. Non-disease factors (1) Heredity: If the child’s diet and sleep are normal with no other discomforts, and there are people in the family with heavy bags under the eyes, then genetic factors are considered to be the cause. (2) Poor sleep: if children do not sleep well, often stay up late, etc., can cause slow venous blood flow, resulting in blood stagnation around the eyes, dark circles, so the child may show the symptoms of bags under the eyes green. 2. Pathological factors (1) Trauma: such as eyelid contusion, eye impact, etc. can cause the child’s eye subcutaneous blood vessel rupture and bleeding, so that the child’s eye bags show the symptoms of blue. (2) Allergic diseases: such as allergic asthma, allergic rhinitis and other diseases can cause venous plexus compression, blood circulation in the lower eyelid is impaired, so the child may have the symptom of blue bags under the eyes. (3) Other diseases: cardiac dysfunction and other diseases, because of the lack of oxygen, children may have difficulty breathing, bags under the eyes and other uncomfortable symptoms. It is recommended that children with blue eye bags and other discomforts should consult a doctor to evaluate their condition and follow the doctor’s instructions to avoid delaying their condition.