See this paper – Veeder TA, Leo RJ. Male genital self-mutilation: a systematic review of psychiatric disorders and psychosocial factors. Gen Hosp Psychiatry. 2017 Jan-Feb;44:43-50. https://doi.org/10.1016/j.genhosppsych.2016.09.003 Epub 2016 Sep 14. PMID: 28041576.
To quote its abstract:
> Data were obtained from 173 cases: genital mutilation (n=21), penile amputation (n=62), castration (n=56) and combined amputation/castration (n=34). Common psychiatric disorders included schizophrenia spectrum (49%), substance use (18.5%), personality (15.9%) and gender dysphoric disorders (15.3%)
So, while it is almost 50% schizophrenia spectrum, substance use is the second most common cause (although personality disorders and gender dysphoria are not far behind, and the difference between the three might not be statistically significant.)
Thanks, I searched for cannabis specifically which would explain why this didn't show up. I imagine much of the substance use auto amputations are in people who do things like PCP.
See this paper – Veeder TA, Leo RJ. Male genital self-mutilation: a systematic review of psychiatric disorders and psychosocial factors. Gen Hosp Psychiatry. 2017 Jan-Feb;44:43-50. https://doi.org/10.1016/j.genhosppsych.2016.09.003 Epub 2016 Sep 14. PMID: 28041576.
To quote its abstract:
> Data were obtained from 173 cases: genital mutilation (n=21), penile amputation (n=62), castration (n=56) and combined amputation/castration (n=34). Common psychiatric disorders included schizophrenia spectrum (49%), substance use (18.5%), personality (15.9%) and gender dysphoric disorders (15.3%)
So, while it is almost 50% schizophrenia spectrum, substance use is the second most common cause (although personality disorders and gender dysphoria are not far behind, and the difference between the three might not be statistically significant.)