Sims with the Chronically Ill trait have a long-term health condition. They will often feel tired, have a headache, and will require more rest than other sims.
Sims with the Immunocompromised trait get sick easier than other sims. They will often have sickness symptoms and may fear crowded places due to their compromised immune system.
Your ill sims will have the option to travel to the Clinic and see a Doctor on their phones. The Doctor will give them some medicine, which will provide temporary relief from their sicknesses! (Originally created by Zero.)