Health is one of the two main attributes of the player, the other being vitality.
Health is on a scale from 0 to 100. If a player's health is lower than 100 then it will slowly regenerate, as long as the player's vitality is greater than 50. This is the only way for a player's health to increase.
Health will decrease slowly if a player's vitality reaches 0. It will also decrease, at a faster rate, if the player is bleeding. Health is decreased directly by being attacked by robots, or falling from a height.
Reaching a health of 0 results in death.