Can Allergies cause headaches???

Allergy is a condition where the immune system reacts unusually to the foreign substances which are not harmful for the body. Allergies can be the origin of some of those headaches. Some of the common allergies that causes headache : Allergic rhinitis: Headache along with seasonal and indoor nasal allergies is more likely due to a migraine headache rather than allergies. But sinus disease cause headaches due to pain related to hay fever or other allergic reactions. An actual sinus headache is actually quite rare. Food allergies: There may be a relationship between food and headaches. For example, foods like processed cheese, artificial sweeteners, and chocolate can activate migraine in some people. Experts say that the chemical properties of some foods that trigger the pain, as opposed to a true food allergy. Histamine: The body produces histamines in reaction to an allergy. Histamines decrease blood pressure that can result in headache. Exposure to allergens attacks your im