Phlegm during the day and no phlegm at night may be related to pharyngitis, acute respiratory infections, chronic lung diseases, environmental factors, postnasal drip syndrome and lung cancer.
1. Pharyngitis is a common disease that can cause excessive phlegm in the daytime, and it is usually most obvious in the morning when the inflammation leads to an obvious increase in the secretion of the throat area.
2. Acute respiratory infections, including pneumonia, tuberculosis, bronchitis, pharyngitis, tonsillitis, etc., are respiratory bacterial or viral infections, which can lead to a significant increase in tracheal and bronchial secretions, and symptoms are not obvious at night after falling asleep.
3. Chronic lung diseases, such as chronic bronchitis, chronic obstructive pulmonary disease, asthma, bronchial dilatation, etc., are also common diseases that can cause phlegm manifestations, and the conscious symptoms at night are lighter than during the day.
4. Environmental factors, including smoking, exposure to harmful gases, dust or allergens, more exposure to such irritating gases during the daytime can stimulate the lungs to cause phlegm secretion, and less smoking at night will result in a relative reduction of secretion.
5. Postnasal drip syndrome, due to the increase of nasal secretion, backflow into the oral cavity, similar symptoms can occur.
6. Lung cancer, increased sputum secretion due to more activities during the day can also lead to more sputum during the day and no sputum at night.
There may be other reasons for having more sputum during the day and no sputum at night. The specific causes should be clarified after medical checkups, and treatment should be carried out according to the doctor’s instructions.