1 Henoch-Schonlein purpura. 2  This condition is an inflammation of the smallest blood vessels (capillaries) of your skin, joints, bowel and kidneys. 3  Signs and symptoms include abdominal pain, blood in the urine, joint pain, and a rash on your buttocks or lower legs.
Allergic rhinitis, also known as hay fever, is a type of inflammation in the nose which occurs when the immune system overreacts to allergens in the air. Signs and symptoms include a runny or stuffy nose, sneezing, red, itchy, and watery eyes, and swelling around the eyes. The fluid from the nose is usually clear.
Rhinitis may be caused by irritants or allergens (substances that provoke an allergic response). In response to these substances, the cells of the body release histamine and other chemical mediators. These are the substances that cause the symptoms of allergic rhinitisâsneezing, runny nose, and itching, watery eyes.In many people, rhinitis is a temporary condition that clears up on its own after a few days.n response to these substances, the cells of the body release histamine and other chemical mediators. These are the substances that cause the symptoms of allergic rhinitisâsneezing, runny nose, and itching, watery eyes. In many people, rhinitis is a temporary condition that clears up on its own after a few days.