I do not know if it is the onset of shin splints, but whatever it is, it’s abnormal for you, so it should definitely be checked out. It could most certainly be the shoes. Did you switch brands? Maybe same brand, but a new type of running shoe?
Personally, I don't wear Nike shoes casually, for running, or for basketball. All different types give me foot pain and blisters (basketball). Once I switch brands, the pain and blisters are gone. I never had the problem before, it is something that started about three years ago.
Point being, I would recommend trying a different brand (I like Saucony for running shoes). Perhaps a set of insoles may do the trick, I personally am not too fond.
That is just my experience. You know your body well, and if you are running 3-5 miles a day now, but before were not running regularly, perhaps it could be something temporary.
A podiatrist will be able to examine your feet and gait, and recommend some orthotics if needed. If you can, schedule an appointment with one.
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