Pain is a pawn capacity: How much pain a person feels.
Most biological creatures including colonists, raiders, and animals feel pain caused by injuries. A pawn's pain level ranges from 0% to 100% and is displayed on their Health tab's Overview. Pain levels are None, Little, Moderate, Severe, and Extreme. Even a little pain causes unhappy thoughts. Once pain passes 10%, it'll start to have an effect on consciousness. If a pawn's pain level meets or exceeds their Pain Shock Threshold they'll go into shock, unable to move. Pawns with the Wimp trait will be incapacitated with only minor pain of 20%.
Most pain is temporary, but scars and certain diseases can cause long-term pain. A painstopper implant will get rid of all a colonist's pain and negate any pain-related mood penalties. Note that colonists with the Masochist trait get a mood bonus from pain instead of a penalty, so it's usually better to leave them alone.
Pain for a given pawn is the sum of the pain from each individual injury, with two extra steps at the end:
pain = pain / healthFactorfor pawns with a healthFactor other than 1.0 (like grizzly bears and other large animals). Humans have a healthFactor of 1.0, so this doesn't impact humans
pain = pain * painFactorfrom health conditions which alter pain. This includes pain-reducing drugs like flake and yayo as well as anesthetic used during operations
Pain from an individual injury is the product of the severity of the injury (the number of HP missing for things like cuts and burns) and the pain per severity for the injury type. For example:
- 30 burn damage causes 30 damage × 0.01875 pain per severity = 56.25% pain
- 30 cut damage causes 30 damage × 0.00625 pain per severity = 18.75% pain