Hello, I see many patients with sore throat every day. The most common cause can be a common cold, and except being accompanied by signs like runny nose, or cough, it also does not last more then 5 days. If you have symptoms of being tired for more than a week, fever, painful nodes on the neck, difficulty swallowing, and its not getting better after a week, but worse, then you should consider a throat visit to you physician so he checks if its a bacterial infection and it needs antibiotics, or run a thyroid check-up to rule out a acute inflammation or other problems of it.