What happens when you fall and hit your head on the floor?

Well, if that happens there can be many outcomes such as, having a bump on the head that may not disappear in a few days but, if it is really serious you should immediately go see a doctor. There will also be a 50% chance of the person getting unconscious since it depends how hard the impact was with the floor, then there is a case which is known as "amnesia" though it is quite rare for people to accidentally have it.

On the whole, you should always take care of yourself and be aware of your surroundings to avoid causes and accidents.