Sore throat for 3weeks.hurts mor in the right or left in the night.had white patches but it disappeared over tim.no other symptom.should i be worried?

Doctor can examine: New throat pain can be from a strep throat infection (antibiotics are needed), a cold or flu virus (antibiotics usually not used), or from some other causes such as stomach acid reflux, allergies, irritants, etc... Usually, a person sees the doctor if the sore throat is bothersome, recurrent, or doesn't go away quickly, mainly to see if antibiotics like amoxicillin are needed.