Sounds like it could be shin splints.
One question I have to ask is, how new/old are your running shoes? Normally either the wrong type of running shoe or shoes that are worn beyond their milage limit are a common cause of shin splints.
A couple years back I started casually running for exercise, and after maybe a few weeks, I had horrible pain at the sides of my lower shins. It seem to hurt the most when I stopped to walk. So I took a couple weeks off and got a new pair of running shoes... haven't really had a problem with shin splints since. Just remember to get new shoes every 300-500 miles.
Another possiblity is if your first starting to run/train, doing too much early on can cause problems. Make sure to gradually increase milage and don't over do it.
I don't know much about stress fractures, only that it's an overuse injury, so, cutting back on milage may help. Also running on softer surfaces like a trail instead of pavement puts less stress on the joints & bones.
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