Treatment of hayfever with loratadine a new non sedating antihistamine
Allergic rhinitis that occurs during a specific season is called "seasonal allergic rhinitis." When it occurs throughout the year, it is called "perennial allergic rhinitis." Rhinosinusitis is the medical term that refers to inflammation of the nasal lining as well as the lining tissues of the sinuses.This term is sometimes used because the two conditions frequently occur together.Allergic rhinitis is the correct term used to describe this allergic reaction, and many different substances cause the allergic symptoms noted in hay fever.Rhinitis means "inflammation of the nose" and is a derivative of rhino, meaning nose.Since allergic rhinitis is frequently caused by pollen, symptoms occur when pollen is in the air.Trees primarily pollinate in the spring, while grasses pollinate in the spring and summer.One of the most common forms of allergy is allergic rhinitis ("hay fever"), which produces symptoms like An allergic reaction occurs when the immune system attacks a usually harmless substance called an allergen that gains access to the body.The immune system calls upon a protective substance called immunoglobulin E (Ig E) antibodies to fight these invading allergic substances or allergens.
Mast cells release a variety of chemicals into the tissues and blood, one of which is known as histamine.Even though pollen is usually invisible in the air, pollen is a potent stimulator of allergy.Pollen lodges in the nasal lining tissues (mucus membranes) and other parts of the respiratory tract, where it initiates the allergic response.Up to 7.8% of American adults suffer from allergic rhinitis.Approximately one in four people with allergic rhinitis also has asthma.