4-year-old children with nasal congestion, sometimes runny nose, need to be considered from the respiratory tract infection, allergic rhinitis, cold air stimulation and other aspects. 1. Upper respiratory tract infections: children with upper respiratory tract infections can appear in the early stage of nasal congestion, runny nose and other manifestations, the amount of time more or less, through the 3-5 days after the obvious relief, and gradually cured. 2. Allergic rhinitis: if children have nasal congestion, often runny nose, and accompanied by nasal itching, sneezing and other symptoms, especially before going to sleep, in the morning, or contact with suspected allergens is more obvious, this situation also needs to be alert to allergic rhinitis. 3. Cold air stimulation: If the child is only nasal congestion, runny nose and good spirits, normal diet, we need to consider the possibility of cold air stimulation of the nasal mucosa caused by this situation, parents should not worry too much, you can let the children pay attention to rest, drink more water can be relieved. Cause 4-year-old children with nasal congestion, sometimes runny nose causes more, if after the above treatment, the symptom relief is not obvious, it is best to go to the hospital in time, to clarify the cause of the disease and timely treatment.