It is a chronic health condition that causes difficulty breathing, tightness in the chest, difficulty in coughing and wheezing (a whistling sound can be heard). The patient has breathing issues in this lung disorder because of swollen, narrow and inflamed airways. This results in the body expelling mucus, resulting in a coughing attack. Further breathing becomes difficult and leads to a wheezing sound. In severe cases, the patient needs to be given immediate medical attention. Asthma happens because of a sudden attack that lasts for a few minutes to a few hours. The cause of asthma could be allergies to dust, smoke, pollen, pet dander etc. The other common cause of asthma includes physical exertion like exercise. The disease is more common in winters.