Severe Asthma Overview Severe asthma is the most serious type of asthma, where symptoms are harder to control even with high doses of medication. Find out more about this condition and how to stay well. [Please download the PDF file if you are unable to view the image below.] Download brochure (2.03 MB, PDF) Related Articles Asthma Asthma Action Plan Asthma Action Plan Single Inhaler Maintenance and Reliever Therapy (SMART)Related DepartmentRespiratory and Critical Care Medicine