DEAR MAYO CLINIC: I have had allergies since childhood, suffering during both the spring and fall seasons. This past month, however, I am experiencing more congestion and mucus, and I even have some facial pain. I'm beginning to wonder if my symptoms are really from allergies or if they may be caused by a sinus infection instead. How can I tell the difference?
ANSWER: Allergies and sinus infections often are mistaken for one another. But they are two separate conditions. By paying close attention to the specific symptoms you have, you can usually identify which one is more likely to be causing the problem.
When someone has allergies, it means their body is negatively reacting to allergens, such as pollen, dust mites or pet dander. This reaction happens when the immune system releases certain substances, such as histamine, into the bloodstream. This leads to allergy symptoms, which may include itching, sneezing, sinus pressure, nasal congestion and discharge. Although allergies can produce many of the same symptoms as a sinus infection, the condition is different.
