What happens when you fall down a flight of stairs?

The damage done to the person might be affected by the fact that they might be falling backwards or forwards. If the person falls backwards they might hurt their spinal cord or their butt but if a person falls forwards then they might hurt their face or chest or any other vital organs in their body. Also they might not suffer high pains if they fell down 2 or 3 stairs but if they fall down half a flight of the whole flight of stairs then they might be hurt pretty bad.