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Cough of clear mucus for a couple months is most often due to inflammation. Infectious causes are more ocmmon, but typically would not persist for a couple months. The inflammation can either be in the chest or in the upper airways that causes drainage into the throat.
The inflammation can be due to chemical irritation, such as from smoking. In a non-smoker, it would most often be due to allergy inflammation.
There are several options for management, some of which are available over the counter. An oral antihistamine is the usual first line treatment. A medicine to thin the mucus, such as guaifenesin, may help to ease symptoms, even though it does not actual treat the underlying cause. The next step would usually be steroids, either as a nasal spray or inhaler, although only a nasal spray is available over the counter, called Nasacort.
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