Neurosis ≠ Mental Illness Early this morning, my "academician" sister, whom I hadn't seen for a year or two, came again. She's a typical mental patient, has a daughter, and her husband is a very honest remote worker. I saw him sitting next to me before; he's probably a graphic designer. When we were in graduate school, our professor talked about the most typical diagnostic feature of mental illness: hallucinations/delusions. Simply put, she can talk to another person in this world, someone who only exists in her mind. Like this sister, she used to come to Starbucks often. She always liked to wander around, talking to herself, saying she was the Secretary-General of the United Nations; saying she was an academician; saying she felt like she was in a meeting, rambling on and on… She liked to take out a notebook and write something, as if she were doing calculations. Just now, she was talking to that person in thin air: She doesn't like the medication the doctor prescribed; it was prescribed by her father… Of course, there are many other mental patients, and a very important facial feature is the obvious dark circles under their eyes, a sign of not getting enough sleep. In medicine and psychology, neurosis is actually a form of neurosis, such as bipolar disorder, depression, and anxiety disorder. All these conditions require a diagnosis, along with a history of impaired social functioning and prolonged impairment. Therefore, what the average person perceives as neurosis, is actually a medical psychosis (schizophrenia: a condition where more than one person exists within a single body, splitting into several individuals).