Red, itchy watering eyes, sinus congestion, post nasal drip, coughing and even skin reactions, etc. are commonplace signs of allergic reactions to something (an allergen) the body was exposed to, internally or externally. In technical terms an “allergen” is a foreign substance that stimulates an allergic reaction in the body. The reaction is mostly due to histamines in the body that over respond during an inflammation cycle. That is why over-the-counter medications that have anti-histamines are the common medications taken…
