Some possibilities: Some people spit because they picked up the habit and haven't stopped it. In other cases, there is 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. It may take visits to one's primary care doctor plus an ENT doctor to figure out if there is a medical problem needing attention.
Answered 4/16/2019
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