Certain foods should be avoided if you have a history of sinus problems. First on the list of foods to avoid is dairy products. These products are known to cause congestion and aid in the production of mucus, which can worsen existing sinus conditions. Refined sugars, found in most snacks and sugary drinks, can cause inflammation, and foods with gluten can also aggravate the sinuses.  Other foods like tomatoes contain certain histamines that can trigger an allergic or immune response, particularly in those who are already sensitive.