Post nasal drip is, "a condition in which mucus from the back of the nasopharynx drips down the back of the throat. It may be caused by sinusitis or other inflammatory disorders. Symptoms include the intermittent blocking of one or both nostrils and an unpleasant taste caused by the mucus." We would add that the sensation of dripping down the throat is quite annoying, so to make ourselves more comfortable we attempt to clear the nose and throat constantly by swallowing, coughing, spitting, etc. In the process, the throat can become quite sore and irritated. Normally, we produce mucus every day in our noses and throats; in fact we produce over a quart per day. Microscopic hairs lining the inner surface of the nose and sinus take care of the mucus, brushing it backward to the throat where we swallow it. During the process, dangerous particles such as bacteria and viruses are sent to our stomach where they are destroyed.
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