Cough is very closely related to rhinitis, for example, rhinitis or sinusitis causes nasal snot to flow back into the throat, which is the most common cause of chronic cough in non-smokers; nasal allergies cause itching of the mucous membranes of the nose, throat, etc., and occasional coughing.
Some children have a cough that lingers for weeks or even months, especially in the middle of the night when they go to bed or in the early morning when they first get up, and even when they feel nauseous and want to vomit. At this time, the cough medicine is mostly ineffective, and an examination reveals a very sticky and yellow secretion near the sinus opening in the nose, which forms a thin trickle downward to the nasopharynx, and then the oropharynx. The nocturnal cough is caused by the unconscious flow into the trachea.
When you get up, the nasopharyngeal secretions quickly get stuck in the pharynx, causing nausea and loss of appetite (due to swallowing too much nasal pus), so only giving general cough medicine or phlegm can’t cure it. After all, this is one of the common causes.