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.
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. 4  Histamine is a key chemical cause of allergic rhinitis and other allergic reactions.