This is most probably a residual of the cold you had; your vocal cords may still be slightly inflamed especially if you're coughing and clearing your throat/expectorating sputum frequently as this imposes further strain on the vocal cords and delays their full recovery. Drink WARM (not hot) herbal infusions with a teaspoon of honey, it should help hasten your recovery.
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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.