A member asked:

After fast walking, i became fatigued, my legs felt tired, i felt breathless and i got lightheaded for a brief sec. what could be the cause?

A doctor has provided 1 answer

Many possibilities: Obesity, deconditioning, anemia, thyroid excess, thyroid deficiency, congestive heart failure, renal failure, anxiety, neurocirculatory asthenia and many other possibilities. You need testing and further evaluation.

Answered 1/10/2014

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