As many as 300 million people around the world suffer from asthma, and around 250,000 die from it each year. Also, with its rates surging around the globe over the past few decades, there is currently no cure for asthma.

Here in this TED Ed’s video “How Does Asthma Work?”, Cristopher E. Gaw explains why people get asthma, and how this disease can be deadly. He also describes the main symptoms and treatments of asthma.