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The diagnosis of paranoid schizophrenia is not easy. Proper evaluation by a psychiatrist is needed to make the final diagnosis. The individuals with schizophrenia show symptoms like hearing voices talking or voices are giving commentary, suspiciousness against anyone or even family members, ideas of prosecution, ideas of reference, etc. These should be present persistently, and in usual cases, there is no insight about the symptoms. It is the family and friends who take the patient for evaluation and not the patient he or herself visits the doctor for a diagnosis.
Yes, depression or anxiety can be the possibilities, but these too should be evaluated. Symptoms of depression like low mood, anhedonia, reduced energy, fatigue, negative thoughts, bad thoughts, lack of surety about future, feelings of helplessness, worthlessness or hopelessness, etc. are seen.If he has doubts about his symptoms, he should be evaluated by a psychiatrist.