Children with edema inside the nasal cavity will have obvious nasal congestion, runny nose, and often cry or even wake up when their nose is not ventilated during sleep. It is best to take your child to the hospital for a checkup to clarify the cause of the edema in the nasal cavity. Most of the cases are caused by allergies, it is recommended to use physiological sea saline to clean up the nasal cavity and then spray with mometasone furoate nasal spray, which can play an anti-inflammatory and swelling effect. Avoid exposing your child to allergens to reduce the chance of allergic diseases, and also take oral montelukast sodium tablets, which can effectively improve the situation of nasal mucosal edema.