In clinical practice, it is rare for a child to have a cough during the day but not at night. There are three reasons for this: individual differences, allergies, and differences in neurological excitability. Some children drink more water during the day and are usually in the care of a guardian other than their parents when they have a cough. The child may have a cough but the parents are not aware of it, or the child may drink more water during the day and therefore mask the clinical manifestations of the cough. Furthermore, children who have allergies, such as sleeping in places other than home, such as kindergartens or schools, which are being renovated, or the presence of physical factors that cause allergies in children, such as pollen or odors, may also cause a difference in the frequency of coughing. Finally, the different excitability of the nerves can also lead to irregular coughing, because the degree of excitation of the human vegetative and parasympathetic nerves is different during the day and at night. Children who have frequent episodes of symptoms can go to the hospital for further consultation to avoid delaying their condition.