 Those suffering from post-schizophrenic depression often suffer from social isolation due to their illness, which may increase depression levels.There is strong evidence of stigma-related isolation against those suffering from mental illnesses in a variety of societies, especially those with schizophrenia as they are often viewed as dangerous and unpredictable.Because of this isolation and studies linking social isolation and depression, it is possible that patients under these stigmas eventually develop post-schizophrenic depression.