To avoid colds and flu that often bring on sore throats, stay away from people who are sick; wash your hands often; do not share food, drink, or utensils; keep your hands away from your eyes and face; eat a healthy diet; get plenty of rest; and drink lots of fluids to help your body ward off disease.
One cause of sore throat, especially in the winter, is the flu. The CDC recommends that everyone older than 6 months get a flu vaccine every year.
If you suffer from allergies, you may be prone to sore throats. Gastroesophageal reflux disease (GERD) may also give you frequent sore throats. Getting treated for these problems can usually lower the number of sore throats, so talk to your doctor.