The cause is unknown, it can be caused by your enviromental surroundings or it can be a genetic trait. There are other reasons but these two are the most logical.
Shortness of breath Chest tightness or pain Wheezing when exhaling, which is a common sign of asthma in children Trouble sleeping caused by shortness of breath, coughing or wheezing Coughing or wheezing attacks that are worsened by a respiratory virus, such as a cold or the flu