1 This condition is an inflammation of the smallest blood vessels (capillaries) of your skin, joints, bowel and kidneys. 2  Signs and symptoms include abdominal pain, blood in the urine, joint pain, and a rash on your buttocks or lower legs.
Description. Allergic rhinitis (AR) is the most common allergic condition and one of the most common of all minor afflictions. It affects between 10-20% of all people in the United States, and is responsible for 2.5% of all doctor visits.
Hay fever facts. 1  Hay fever (allergic rhinitis) is a common allergic condition. 2  Symptoms of hay fever mimic those of chronic colds. 3  The best way to treat an allergy condition is to identify the allergic trigger and avoid it.  Histamine is a key chemical cause of allergic rhinitis and other allergic reactions.