What are signs of exercise intolerance?

Think along the. lines of more shortness of breath and/or fatigue than you would otherwise expect at any particular level of exercise(exertion).
Interesting question. In medicine i think of a "sign" as an objective observation by the examiner, vs "symptom" as a subjective self observation by the patient. There fore the sign of exercise intolerance would be the patient "failing" an exercise stress test with a critical result.

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So what are signs of exercise intolerance?

Powerful Impact. The signs of exercise intolerance can include unusual breathlessness, muscle pain, and increasing muscle weakness with exercise. After exercise one can experience headaches, dizziness and fatigue. Exercise intolerance can have a profound negative impact forcing an individual to make significant lifestyle changes. Read more...