Nasal congestion in children can be caused by inflammation, nasal deformity, trauma, intranasal swelling, intranasal foreign body and other factors, it is recommended to consult a doctor in time. 1. Inflammation: such as sinusitis, rhinitis, etc., the inflammatory reaction can stimulate the local mucosal congestion, edema, thus triggering nasal congestion, the child may also be accompanied by a runny nose, decreased sense of smell, fever, nasal itching and other symptoms. 2. Nasal deformity: such as atresia of the anterior nostril, external nasal deformity. 3. Trauma: such as skull base fracture, nasal bone fracture, etc., the child may also be accompanied by severe pain at the fracture site and pressure pain. 4. Intra-nasal masses: such as nasal polyps, fibro-angiomas, etc., which cause nasal congestion due to blockage of the nasal cavity. 5. Intra-nasal foreign body: mostly put in by children themselves when playing, mostly manifested as nasal congestion on one side, which may be accompanied by foul-smelling nasal discharge, bleeding and other abnormal manifestations. Children with symptoms of nasal congestion, persistent unrelieved or accompanied by other discomforts, should consult a doctor in a timely manner, under the guidance of the doctor to identify the cause of the disease, and if necessary, to carry out appropriate treatment.