more detailed history is needed. there are lots of causes of dry cough:
1-post nasal drip or upper airway cough syndrome
2-cough variant asthma / hyperactive airway disease
and since you are started to have sputum, you need to be seen by a physician.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.