Almost half of Irish people have never heard of a condition which currently affects some 440,000 people here and is the world's fourth biggest killer.

COPD (chronic obstructive pulmonary disease) is an umbrella term for a number of chronic lung disorders, including bronchitis and emphysema. It is a progressive, disabling condition caused by a narrowing of the airways. Smoking is the main cause.

According to the results of a new survey, launched to coincide with World COPD Day (November 14) today, among those who have heard of the condition, at least eight in 10 are unfamiliar with its symptoms, while at least three in four do not know what causes it.

"People don't seem to understand what exactly COPD is, or what causes this terrible disease. When diagnosed early, it can be treated and managed effectively and even severe COPD patients can improve their symptoms by availing of pulmonary rehabilitation programmes," explained Prof Tim McDonnell, national clinical lead of the HSE's COPD programme.

Meanwhile the survey also showed the huge impact COPD can have on those living with the disease. At least half of people suffering from it said it negatively impacted on their quality of life and almost one in five admitted that they do not socialise with family and friends as much as they did before developing it.

At least one in three said the condition had a negative effect on their career, with many having to reduce their hours and some people having to retire early as a result.

"Unfortunately COPD, if left untreated, often leads to permanent lung damage. Early treatment and smoking cessation improves symptoms, as well as lung function, and ensures a better quality of life for patients," explained Dr Edward McKone, president of the Irish Thoracic Society.

He added that raising awareness of the condition is essential if COPD is to be diagnosed early in more people.

"Early diagnosis is the key to improving symptoms and preventing further lung damage and it is important to note that it is never too late to seek medical help for this condition," he said.

The survey involved just over 1,000 people from around the country.