How To Tell the Difference Between Allergies vs. Sinus Infection (Sinusitis)

Allergies occur when your body's immune system reacts to a foreign substance. Some may be "seasonal" when you get them only in the spring or fall, or they may be year-round. Sinusitis or a sinus infection is an inflammation or swelling of the tissue lining the sinuses. A sinus infection usually happens after you've had a cold or allergies. You should seek medical attention if you have trouble breathing; any of the signs or symptoms are particularly severe.

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