Migraines with Aura and Estrogen Hormone Therapy – Why do these two things sometimes not go together?

The hormone estrogen is known to be a hormone that increases your risk of clots. That's why we often don't give it to patients who have medical conditions that increase the risk of clots and stroke, like diabetes, high blood pressure, smoking, or obesity. So you put two things together that both increase your risk of clots or estrogen, and then blood disturbances in your blood vessels that also increase your risk of clot and stroke.