An allergic reaction occurs when a substance such as pollen, grass, mold, dust, detergent or food triggers the immune system to inappropriately respond by releasing histamine. Histamine is a neurotransmitter that causes many reactions including inflammation, increased mucus production, respiratory and nasal congestion, watery eyes, runny nose and even bronchial constriction. Removing the allergen is the first line of defense for combating allergies. However in the case of environmental allergens such as grass and pollens, removal of the culprit is not always an option. Thankfully, there are herbs to help!