When someone with asthma suddenly experiences symptoms, it is usually caused by exposure to one or more triggers. In almost all cases, only very mild symptoms are experienced and using the right medication will quickly control them again.

However, if medication does not relieve symptoms and they continue to worsen, someone may experience an acute attack, which may be potentially life-threatening because of the on-going breathing difficulty.

It is very important for those with asthma or those who care for them to recognise the possible signs of such an attack and know what action to take.

The best approach is to know and use a plan of action that has been agreed with a doctor or nurse.

The severity of sudden symptoms and the likelihood of them worsening to an acute attack may depend on how well underlying inflammation in the airways is being controlled with medication. Asthma medications and the way they are used should be reviewed regularly with a doctor or nurse to ensure asthma is controlled.