Hello
Cough with expectoration ( phlegm ) from white to yellow in color , cough worse in the night and early in the morning ,may be due to these possibilities , these include.
1 Asthmatic allergic
bronchitis :Airways hyperresponsive that is secondary to inflammatory disease that results in recurrent or chronic episodes of wheeze,
shortness of breath chest tightness &/or COUGH particularly at NIGHT or in the early in the MORNING ( as these few symptoms present in you). Diagnosis can be confirmed by physical examination by a physician and clinical examination .
2 Bronchiectasis
.Defined as localized irreversible dilatation of the bronchi.
.Condition results in airflow obstruction & impaired clearance of secretions .
Present with chronic sputum (phlegm) production.
It may be mild in your case with these symptoms .
Ratty cough producing sputum ( phlegm) after colds only.
Sputum production of Change of position cause production of sputum,
Xray chest and sputum examination will find the disease.
3
Tuberculosis :Diagnosis can be confirmed by
X RAY chest and blood examination for C B C , E S R ( if >100 mm 1st hour strongly suggestive of chronic disease of lungs or tuberculosis ) . Also get in sputum for A F B examination.
In my opinion deal as mentioned above.
Hope this information will be helpful for you.
Good luck.