There are ways people can help improve their asthma symptoms, according to experts and studies.
The extremely common condition affects 5.4 million people in the UK and can be very mild in the problems it causes, or require regular treatment due to being dangerous.
Data from Asthma + Lung UK says there are around 75,000 emergency admissions to hospitals every year in the UK, while 1,200 people die every year from it.