How does immunotherapy for hay fever work?
Immunotherapy involves regular injections or oral doses of a particular substance known to produce an allergic reaction. The amount of substance given is increased gradually each time and treatment usually continues over several years. In some people, the overall immune response decreases, leading to an improvement in hay fever symptoms.
Author: Lauren Donley
First answered: 10 Nov 2014
Last reviewed: 19 May 2018
Rating: 4.2/5 Votes: 435