A member asked:

While i was running i stopped to answer my phone. i was out of breath, body felt like it was shutting down on me. i lost my vision for a few min. couldnt see anything but white light. what happened?

3 doctors weighed in across 2 answers

Gravity.: Blood vessels in your legs get very dilated when you exercise. If you stop quickly and stand still gravity moves all your blood down to your legs and leaves your brain a little short. Your blood ran to your legs and left your head. This is why most exercise programs have a gradual cool down period.

Answered 5/24/2013

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Check up: An irregular or fast heartbeat can cause these symptoms.

Answered 5/25/2013

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