Our expert says:
It's a circulation issue, as the body sends blood to different areas to help you cool off. THe extremities swell because of the higher blood flow to them. That's why it's worse in the heat - more blood is needed at the skin to help cool you down, so the body does its job, with that small side effect.
It's not serious, and fairly common. It's an inconvenience, and sometimes throbs, but over time, the body does adapt and you do get used to it, so it's less of a problem once you get fitter.
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