字幕表 動画を再生する 英語字幕をプリント Diabetes, obesity and heart disease are all linked to stroke. However, avoiding known risk factors still may not prevent a stroke from happening. I'm Erin White with your latest health news. A recent study found that about half of stroke cases were caused by known risk factors--meaning that the other half of stroke cases were caused by factors not directly associated with risk of stroke. The researchers determined that high blood pressure and smoking tobacco were the two biggest causes of stroke. Ask your doctor how to lower stroke risk.