Sometimes, you may only have asore throat on one side.
Postnasal Drip
Postnasal dripis when mucus drains down your throat.
One of the symptoms of postnasal drip is a sore throat.

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Allergic rhinitis (also called hay fever or nasal allergies) can cause a sore throat.
The collection of mucus at the back of your throat can cause discomfort and soreness in the throat.
This is just a matter of overuse of the muscles in your throat.
You might also find that a sore throat at night is triggered after eating certain foods for dinner.
It might also help to share patterns you notice when your sore throat symptoms come and go.
Harvard Medical School.Sore throat (pharyngitis).
Harvard Medical School.Treatments for post-nasal drip.
American Academy of Family Physicians.Allergic rhinitis (allergies).
Harvard Medical School.9 at-home treatments for acid reflux.
Baylor College of Medicine.When to worry about a sore throat.
Mount Sinai.Pharyngitis - sore throat.
Centers for Disease Control and Prevention.Sore throat.