If you were talking loudly at a noisy, smoky bar, you may have strained your vocal cords, resulting in throat soreness. If you have hay fever, or if your allergies are acting up, that can make your throat feel scratchy. Even sleeping with your mouth open in the winter, when the air can get as dry as the Sahara, can cause a sore throat.
Drink plenty of liquids.
Gargle with warm salt water.
Put a humidifier in your bedroom which can also help.
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