It’s the most common chronic disease in Europe. One in four of us here in the UK will have to deal with an allergy at some point in our lives. And, as we find out in this episode, it’s all down to your immune system making a mistake and attacking harmless proteins or pollen. Presenter Anna Richardson talks eczema, asthma, hay fever and food allergies with Dr Helen Brough from HCA Healthcare UK’s The Portland Hospital.