Final answer:
Chronic schizophrenia is a serious mental illness that onsets in late adolescence or early adulthood. The common signs and symptoms include hallucinations, delusions, disorganized thinking, and negative symptoms. Treatment with antipsychotic medications is usually needed.
Step-by-step explanation:
Chronic schizophrenia is a serious mental illness that typically onsets in late adolescence or early adulthood. The most common signs and symptoms of chronic schizophrenia include hallucinations, delusions, disorganized thinking, and negative symptoms. These symptoms can significantly impact a person's ability to function and interact with others. It is important to note that schizophrenia is a lifelong condition that generally requires long-term treatment with antipsychotic medications.