Allergies are 'gender related'

Doctors have discovered a child's risk of developing an allergic disease is doubled if a parent of the same sex has suffered from it, new research has claimed.

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What is asthma?

Asthma is a condition that affects the airways - the small tubes that carry air in and out of the lungs.

Asthma is the common chronic inflammatory disease of the airways Credit: Clive Gee/PA Archive

When a person with asthma comes into contact with something that irritates their airways, the muscles around the walls of the airways tighten so that the airways become narrower and the lining of the airways becomes inflamed and starts to swell.

Sometimes, sticky mucus or phlegm builds up, which can further narrow the airways.

These reactions cause the airways to become narrower and irritated - making it difficult to breath and leading to symptoms of asthma.

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