Asthma is usually an allergic reaction but over-exertion, stress and infection can also bring it on. It has also been linked to parental smoking. Asthma can also run in families.
What is the purpose of the research? To understand the different causes of asthma around the world, in richer and poorer countries. There are many unanswered questions about what causes asthma and how ...
"You don't want to keep putting yourself in that situation." The exact cause of asthma isn't known, according to the NHS. People who have asthma have swollen airways that narrow and become clogged ...