What is Asthma ?
The air we breathe is carried into and out of our lungs through a system of finely branching tubes. The tubes consist of a wall lined by muscles and a hollow interior, which allows the smooth passage of air. The hollow interior is lined by a tissue rich in blood vessels, nerve endings and mucous glands. It is essential that the hollow interior is maintained without narrowing or obstruction to provide smooth passage of air.
Asthmatic patients are sensitive to variety of factors that causes the airways to react abnormally when exposed to them and lead to narrowing of the hollow interior. The muscles around the outer walls squeeze the tubes tight and the inner lining becomes swollen. This leads to obstruction of the airways and makes the air flow limited
What causes asthmatic airways to behave in this way ?
• Genetic (hereditary) predisposition-asthma and allergies are known to run in families
• Environmental factors-occupational exposures, indoor air pollution, tobacco smoking may predisposed.