What is Asthma disease?

Asthma is a disease in the airways to the lungs. In this disease, the airways get swell & narrow and produce extra mucus. The effects of this are difficulty in breathing, coughing, wheezing (sharp sound while breathing) and shortness of breath.

Generally, when we inhale air through the nose inside us, and go down into the airways passing through the throat, and finally reach the lungs. There are many small air passages inside the lungs which delivers the oxygen into the bloodstream.
When the lining of these airways get swells and the muscles get tightened, it results in Asthma. The mucus fills the airways, and this further reduces the amount of passing air.