Pharyngitis is caused by swelling in the back of your throat (pharynx) between your tonsils and voice box (larynx). Sore throats can be caused by several conditions, including:
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The common cold, seasonal flu, mononucleosis (Epstein-Barr Virus), and other viral infections
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Strep throat and other bacterial infections
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Environmental factors, such as dry air or allergens
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Gastroesophageal reflux disease (GERD)
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Repeatedly straining the vocal cords by singing, yelling, or screaming