It's a broad term, just like "Sick" can mean anything from having a seasonal cold, to terminal cancer. The causes vary, the prognoses vary, the treatments vary.

It's a broad term, just like "Sick" can mean anything from having a seasonal cold, to terminal cancer. The causes vary, the prognoses vary, the treatments vary. Talking about "Sickness" without specifics is profoundly unhelpful. Same with homelessness.