Allergic rhinitis, popularly known as hay fever, is a type of inflammation of the nose that occurs when the immune system overreacts to allergens in the air. Signs and symptoms include a stuffed or runny nose, sneezing, and itchy eyes, which can become red and inflamed. The mucus that oozes from the nose is usually clear. Symptoms usually start within minutes of exposure to the allergen and can affect sleep, work capacity and ability to concentrate. In people allergic to pollen, symptoms usually occur with greater intensity during certain times of the year. Many people with allergic rhinitis also have asthma, allergic conjunctivitis or atopic dermatitis. The symptoms of allergic rhinitis are similar to those of the common cold; however, they rarely last longer than two weeks and do not include fever.