Allergies
Infections often cause sore throats, but allergic reactions can also cause inflammation and irritation in the throat. Pollen, pet dander, dust mites, mold spores, and other airborne allergens can trigger allergic reactions. After inhaling, the allergens enter the body through the nose or mouth and reach the lungs and sinuses. From there, they can enter the bloodstream and travel throughout the body, causing various symptoms. For example, when they reach the throat, they may result in throat swelling (which is why people with allergies are more likely to get hoarse than those without allergies).
Allergies can cause a sore throat in many ways. People with allergies often notice that their noses can be stuffy, but they may not realize that this also causes back pressure on the throat. Less air can get through, so the throat will likely feel dry and sore. People with allergies are also likely to have mucus in their throat, making it more prone to irritation and soreness.
