One way to understand what asthma feels like is to make a fist with a small tunnel, and place it up against your mouth. Now, blow out like you are blowing up a balloon. Feel the air as it touches your hand at the end of the tube? That is like normal breathing.
Then slowly close your fist so that the tunnel becomes, smaller, and smaller, until it is tightly shut. Feel how the air doesn’t come through anymore? This is what a person suffering from asthma feels like during a serious asthma attack.
When a person has an asthma attack three things happen in the airways:
During an asthma attack, swelling, buildup of mucus in the airways, and muscle tightening all make the airways smaller and make it difficult to breathe.