Have you ever felt a pain in your chest or a numb feeling in your body and ignored it, hoping it'll go away?
Or perhaps worse, you seek advice from Dr Google and immediately self-diagnose with the wrong condition without ever speaking to a professional.
Two of the most frightening and immediate health conditions - heart attacks and strokes could happen to any of us at any time.
You may watch this story and think you don't fit into the category but that's exactly what one survivor thought too.
Story spoke to two people who know exactly what it feels like and now, they know what to do.
Would you know if you were having one and could you recognise the signs?
Watch the video for the full Story report.
