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.
Medical Definition of ALLERGIC RHINITIS. : rhinitis caused by exposure to an allergen; especially: hay fever.ADVERTISEMENT. noun. : rhinitis caused by exposure to an allergen; especially: hay fever.efinition of ALLERGIC RHINITIS. : rhinitis caused by exposure to an allergen; especially: hay fever. ADVERTISEMENT. noun. : rhinitis caused by exposure to an allergen; especially: hay fever.