If a child often has nasal congestion at night but is fine during the day, it is often considered to be caused by rhinitis or adenoid hypertrophy. Parents need to observe carefully to determine the cause of the onset and take the child to the ENT department of the hospital for a comprehensive examination. Common causes and treatment 1, rhinitis: babies who have allergic rhinitis and are exposed to dust mites, dust mites or other allergenic items will have symptoms of nasal congestion. Parents need to determine whether there are certain items that will cause allergies in their children, go to the hospital for allergen testing to rank the factors that cause allergies, and can follow medical advice to apply antihistamines, such as loratadine. If it is infectious rhinitis, it may be necessary to apply anti-infective drugs, such as penicillin, etc.; 2. Adenoid hypertrophy: As the hypertrophied adenoids block the nostrils and compress the eustachian tube, breathing difficulties will occur, and the symptoms will be more obvious at night when lying down due to the change in position. In severe cases, apnea and other adverse consequences can occur. If adenoid hypertrophy is diagnosed, it usually needs to be removed surgically. Parents should keep the child’s sleep environment at a suitable temperature, clean, dark and quiet, and ensure air circulation and relatively moist air. In addition, it is important to observe the nasal cavity of the child for nasal stools, and to remove them promptly if there is a lot of secretion.