What is the cause of shortness of breath when I am tired?

The symptoms of shortness of breath after exertion should depend on the specific circumstances of the patient. In general, shortness of breath after physical activity often means that the patient has poor exercise tolerance and, in layman’s terms, a lack of physical exercise. However, in middle-aged and elderly patients with underlying cardiac disease, this should be taken seriously and may be a sign of cardiac insufficiency.
Therefore, the symptoms of shortness of breath on exertion should be analysed specifically in relation to the patient’s underlying condition, predisposing factors and other manifestations.