Think of your body as a house, and the blood is water in your plumbing. When you get a water leak, sometimes it’s obvious, but sometimes it’s not until it destroys a wall or ceiling or floods the basement.
In a much more complex and balanced system (like the body) it can disrupt all sorts of things (e. g. flooding your lungs) in *addition* to losing blood, which is bad in and if itself.
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