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The glands in the throat, nose, air passages, stomach and the intestines produce mucous everyday. This mucous is thick and wet and keeps these areas well moistened and helps them to trap and destroy foreign substances such as bacteria and viruses. The mucous in the nose is hardly noticeable because it mixes with the saliva and drips down the back of the throat where it is swallowed continuously. When the body produces excessive mucous and the mucous is thicker than usual, it comes out of the nose as a runny nose.
But if this excess mucous runs down the back of the nose into the throat, it is known as postnasal drip. This condition is mostly caused by the common cold, allergies, flu, sinusitis, sudden change in the temperature and exposure to harmful chemicals and smoke. There is a constant irritating feeling in the throat which makes you want to clear your throat consistently. Postnasal drip can also cause severe coughing, a sore and hoarse throat and ear infection.