In the morning, expectoration may first be due to chronic pharyngitis. It may occur when you get cold or eat stimulating food. The second consideration is that they usually drink too little water, or the indoor air is too dry. Of course, it does not rule out that it is related to other respiratory diseases, such as pneumonia, tuberculosis, bronchitis, etc.
If you have this symptom for a long time, you are recommended to go to the local regular hospital for treatment.
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