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A productive cough can be symptoms of asthma, sinus infection, respiratory infection, gastritis or smoking.
The color of the sputum is only concerning when it is red (blood) or black (dry blood).
If it has only recently started, I would suggest a decongestant as recommended by your local pharmacist, an increase in fluid intake, steam inhalation and rest.
If it continues beyond 48 hours, please see your doctor.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.