Health Conditions : Asthma
Asthma is caused by inflammation of the small tubes, called bronchi, which carry air in and out of the lungs. If you have asthma, the bronchi will be inflamed and more sensitive than normal.
When you come into contact with something that irritates your lungs – known as a trigger – your airways become narrow, the muscles around them tighten, and there is an increase in the production of sticky mucus (phlegm).Common asthma triggers include:
- house dust mites
- animal fur
- cigarette smoke
- viral infections
The symptoms of asthma can range from mild to severe. Most people will only experience occasional symptoms, although a few people will have problems most of the time.
The main symptoms of asthma are:
- wheezing (a whistling sound when you breathe)
- shortness of breath
- a tight chest – which may feel like a band is tightening around it
These symptoms are often worse at night and early in the morning, particularly if the condition is not well controlled. They may also develop or become worse in response to a certain trigger, such as exercise or exposure to an allergen.