is a chronic respiratory disease
in which airways narrow, swell and produce extra mucus. It makes breathing difficult, trigger coughing, wheezing and shortness of breath.
For some people, asthma
is a minor irritation. But for others, it can be a major problem and may lead to a life-threatening asthma attack. Asthma cannot be cured, but its symptoms can be controlled.
An estimated 300 million people worldwide suffer from asthma
, with 250,000 deaths credited to the disease every year.
The number of people with asthma could increase by more than 100 million by the year 2025. Occupational asthma
due to unhealthy workplace conditions significantly contributes to the total number of asthma cases.
High ozone levels
could precipitate an asthma attack.
An estimated 25.9 million people in the United States, including almost 7.1 million children, suffer from asthma. It is the third-ranking cause of hospitalisation among children under 15 in the United States.
The disease frequency of asthma varies widely in different countries, but the inconsistency is narrowing due to the increasing disease frequency in low and middle-income countries and plateauing of the disease in high-income countries.
Most asthmatics also suffer from allergies
Asthma occurs more in boys than girls in the 0-14 year age group in Australia.
Asthma occurs more in females than males in the 15 years and over age group in Australia.
Common causes of asthma are indoor allergens
, outdoor allergens, tobacco smoke
, chemical irritants, air pollution
Most effective medications for controlling asthma are anti-inflammatory drugs
like inhaled corticosteroid