Why do I always feel that someone is watching me?

I always feel that someone is watching me, which may be a symptom of mental illness. The main reason is the feeling of being victimized and being looked at. If there is such a problem, there may be symptoms of schizophrenia. Schizophrenia, as a serious mental illness, is prone to sensitivity, paranoia, auditory hallucinations and hallucinations. I feel that people around me are always targeting themselves, talking about themselves, and even feeling that someone is monitoring themselves, and even influencing themselves through scientific means or instruments such as eavesdropping, light waves and physical waves. At this time, it may be accompanied by serious emotional problems such as anxiety, irritability, fear and fear. The main reason is that there is a serious illusion of being killed and monitored. At this time, it is best to actively treat.