Is a tia or stroke hereditary?

TIA or STROKE: Tia or stroke are due to atherosclerosis of carotid arteries, or clot coming from heart. The majority of these processes happens in people with high blood pressure or diabetes. Both of these diseases has some genetical components. Several other reason people develop stroke like, smokers, in people with cancer, or autoimmune diseases. Most of those reasons has some genetic components.

Rarely: For the most part, the answer is no. There are certain risk factors that can be passed in generations, such as higher chance of having high blood pressure, high cholesterol, diabetes. All of these can increase the chance of having a stroke. Causes of stroke that are truly hereditary are rare and often present early in life (fabry's disease, ehler-danlos syndrome, marphan's syndrome etc).