Health is a measure of the amount of sick people on a colony. Sick people cannot participate in the day to day activities of a colony, and are therefore detrimental to your economy. Bad health in a colony also makes people unhappy.

The main cause of poor colony health is the planet's habitability. Colonies that are located on high gravity planets, planets with an extremely high or low temperature, or those with a bad weather or atmosphere, will have health problems. An underpaid workforce can also cause problems. Some illness is naturally occurring, and a colony with perfect health is impossible to achieve.

Health can be improved by offering good healthcare through sufficient availability of Clinics.