The "ill" status effect is inflicted when you fight sewage eels in Golgotha. If you see a red message in the message buffer saying that the sludge splashes into your mouth and that you gag, then that means you've become ill.
While you're ill, you don't heal naturally, even if you have the Regeneration mutation. The condition seems to abate over time, or at least it did on my character with regeneration.
|Gameplay Mechanics||Achievements - Character Creation(Calling - Arcologies) - Cooking and Gathering - Cooking Recipes - Desecration - Dismemberment - Journal - Faction Hero - Psychic Glimmer- Psychic Assassin - Modification - Relic - Scrap & Bits - Tinkering - Trade - Water Ritual - Reputation - Wish/Cheats - World Map|
|Character Mechanics||Attributes - Quickness - Move Speed - AV - DV - Mental Armor - Hitpoints - Experience - Temperature - Skills - Mutation - Cybernetics - Mutants - True Kin|
|Major Categories||Artifacts - Armor & Equipment - Weapons - Monsters - Factions - Locations - Quests|
|Elemental Damage >||Acid - Electrical - Cold - Heat - Astral - EMP - Explosive - Light - Mental - Vibration|
|Status Effects >||Astrally Burdened - Astrally Tethered - Bleeding - Confused - Dazed - Fates Have Their Way - Fear - Flaming - Frozen - Ill - Itchy Skin - Lovesick - Paralyzed - Phased - Poison - Prone - Sleep - Slipped - Sprinting - Stuck - Stunned|