My sister works in an emergency room. She tells me about people who come in for a diagnosis of a TIA episode. After it has been determined that they suffered a mini-stroke and not a full-blown stroke, we give them lots of information about how to treat their tendency to have strokes. A good proportion of those who have had a TIA will have a serious stroke sometimes in their life.
We nurses and doctors encourage them to go to their physician and set up a program to cut the risk of stroke.
Treatment may include life style changes, like stopping smoking, exercising more, and changing your diet.
More treatment might be taking medicine to keep the blood from clotting, lowering blood pressure and cholesterol. There's a lot one can do to minimize the risk of stroke or TIAs.