Our expert says:
No, it's not a huge issue. It's just blood flow to the extremities to help keep the body temperature down and some people "flush" when this happens, probably due to an individual response and also complexion. It's not a health issue in most cases. Obviously, one can never be too safe, and so if you can have a full medical, you'd have peace of mind, but being red faced in the absence of any other symptoms (chest or arm pain, unusual shortness of breath, dizziness etc) is normally not a problem. I think the temperature regulation is more of an issue, as your experience when you dress warmly indicates. So just keep cool and comfortable, and it should be perfectly alright.
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