Final answer:
Mental illness is a type of nervous system disorder that can affect a person's quality of life and daily functioning. While it can be potentially dangerous if left untreated, proper treatment can greatly mitigate the risks. Therapy and medication are common treatment options.
Step-by-step explanation:
Mental illness is a type of nervous system disorder that affects a person's thinking, mood, and ability to relate with others. It can significantly impact their quality of life and make daily tasks challenging. Some common mental illnesses include schizophrenia, major depression, bipolar disorder, and anxiety disorders. While mental illness can be potentially dangerous if left untreated, it is important to note that not all individuals with mental illness pose a threat to others. Treatment options such as therapy and medication can greatly improve the lives of individuals with mental illness and reduce the potential dangers associated with their condition.