system
Given the following post, respond as if you're commenting on Reddit:
human
Does a condition in which the human body produces too much/more blood exist?
gpt
It depends on what you mean by “blood”. There are a number of components of blood, like red cells, white cells, proteins, and water, among others. 

Overproduction of red cells is called polycythemia vera. If, however, you are discussing the total volume of blood, an overall increase in total volume is most usually caused by a number of disorders that result in over-retention of water by the kidneys.