Medical Genetics Mental health professionals normally diagnose this illness if, during any one- month period of a person's life, that person has suffered two or more of the following Delusions Hallucinations Disorganized speech Grossly disorganized or catatonic behavior Negative symptomsMedical Genetics Mental health professionals normally diagnose this illness if, during any one￾month period of a person’s life, that person has suffered two or more of the following: Delusions Hallucinations Disorganized speech Grossly disorganized or catatonic behavior Negative symptoms