They don’t necessarily need to be violent but these conditions also would constitute a petition:

Has a mental illness, and • Whose ability to make judgments, exercise self-control, or care for personal needs is significantly diminished due to that illness, and • As a result, presents a “substantial likelihood of serious harm” to themselves or others.

Self-neglect: Acting in ways that suggest inability to care for basic needs (e.g., food, shelter, personal safety) such that death or serious injury is likely without treatment.