Some possibilities: There can a medical problem such as post-nasal drip mucus from the nose and sinuses. In more worrisome cases, there is a throat problem or lung problem, such as infection or cancer. Infections can be tuberculosis, chronic bronchitis, etc... It may take visits to a primary care doctor, an ENT doctor, and possibly a lung specialist to figure out which medical problem is causing the mucus.
Answered 4/20/2019
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