Causes of a Sore Throat

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A sore throat can be caused by a number of things. A sore throat may be caused by an inflammation of the throat tissue due to viruses or bacteria. Breathing through the mouth makes the throat dry and sore. Other factors, such as low humidity, smoking, air pollution, yelling, and noxious fumes, can cause a sore throat. A sore throat also can be a symptom of heartburn or indigestion, caused by stomach acid working its way into the esophagus and irritating the throat lining. Sinus drainage from allergies or the common cold is yet another cause of a sore throat.