What to do when experiencing shortness of breath?

With sudden onset shortness of breath, take a minute to see if you can relax enough to slow down your breathing. But if you have one or more of the following symptoms, seek immediate medical care.
•    severe shortness of breath
•    difficulty talking in full sentences
•    chest pain with shortness of breath
•    swelling in the face or abdomen with shortness of breath (a possible allergic reaction).