In order to uncover the reason you may be experiencing shortness of breath, your doctor may request one or more of the following diagnostic tests: 1  Physical exam. 2  Blood tests. 3  Exercise tests. 4  Electrocardiogram. 5  Ambulatory cardiac monitoring. 6  Echocardiogram. 7  Chest X-ray. 8  CT scan of the chest.f breathlessness is sudden and severe, it may be the result of air around the lung or a blood clot in the lungâboth emergency conditions that require urgent and immediate medical attention. Causes. There are many causes for shortness of breath, from the benign and temporary to the more serious that may include:
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