Sore throat pain may increase when you swallow, but as long as you are still able to swallow (even if it hurts), it is probably not serious.
Breathing through your mouth, which may occur when you have a stuffy nose or other cold symptoms, may cause dryness and irritation of the throat. Lack of humidity, which often occurs during the winter months, can make this problem worse.
Nasal drainage down the back of your throat from a sinus infection can also cause irritation of the throat. Sore throat symptoms usually go away once the sinus problem is under control.
If pain prevents you from swallowing, you may become dehydrated. To soothe your irritated throat and prevent dehydration, drink plenty of liquids, such as warm tea and cold beverages, or eat frozen snacks, such as Popsicles.
Severe or persistent sore throat may be caused by several different problems. A visit to your health professional may be needed to evaluate a severe or persistent sore throat.
WebMD Medical Reference from Healthwise