Dear Reader, This is news message from http://www.herbsmd.com - a new website regarding natural & Alternative health care tips and products. Now you will read our first article regarding Allergies from http://healthgate.com/. About 7% of all Americans suffer from hay fever, an allergic condition that can cause runny nose, sneezing, and teary eyes. It is known officially as allergic rhinitis, allergic sinusitis, or allergic conjunctivitis, depending on whether symptoms manifest mainly in the nose, sinuses, or eyes, respectively. Hay fever usually peaks when particular plants are pollinating or when molds are flourishing. People who suffer from year-round hay fever may be allergic to ever-present allergens such as dust mites. Here's how hay fever works. In response to the triggers noted above, an individual prone to allergies develops an exaggerated immune response. Substances known as IgEs flood the nasal passages, white blood cells called eosinophils arrive by the millions and billions, and inflammatory substances such as histamine, prostaglandins, and leukotrienes are released in massive amounts. The overall effect is the familiar one of swelling, dripping, itching, and aching. The mechanism of allergic response is fairly well understood. Why allergic people react so excessively to innocent bits of pollen, however, remains a complete mystery.