Your body is not fully filled.
Your body has several “chambers” or “cavities”, where your organs are stored. There are chest cavity (where your lungs and heart are), abdomino-pelvic cavity (where your guts and stuff are), and skull cavity (where your brain are). Those chambers are **not** filled with blood – in fact, they have some free space between the organs.
Internal bleeding is when your blood is leaking inside one of those chambers. It hurts, because it can only happen if your blood vessels are damaged. It is also mortally dangerous: you are still loosing blood in your veins. The fact, that it spills inside your body doesn’t matter – the blood is useless there. Also, with external bleeding you can “plug the hole”, but with internal you cannot – the hole is inside you.
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