As my asthma got worse I became increasingly reliant on inhalers, pills and antihistamines as well as upon the oral steroid prednisone to stay out of hospital. I tried all the drugs and therapies available. As it was by the time I was in my late 30s I was a frequent visitor to the emergency room. As anyone who has experienced a severe asthma attack can tell you they are terrifying. Before we discuss the causes of asthma, I would like to know what explanation you actually are expecting to find here.