TLDR The conclusion is that more hair loss (androgenetic alopecia) is linked to larger prostate size, suggesting hair loss could be an early sign of benign prostatic hyperplasia.
This document is an observational study that aimed to establish the relationship between androgenetic alopecia (AGA) and the size of the prostate. The study included 65 male patients with AGA, and it found that as the grade of AGA increased, there was an increase in the size of the prostate. The study suggests that AGA may serve as an early marker for benign prostatic hyperplasia (BPH). However, further research is needed to better understand this association and to evaluate the potential benefits of treating AGA with 5-alpha reductase inhibitors in delaying the onset of BPH.
Cited in this study
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19 citations
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April 2014 in “Hormones” Hormones and genetics play key roles in male and female baldness, which can affect mental health and may be linked to other health issues.
5 citations
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November 2012 in “The Journal of Urology” Early hair loss may indicate future prostate issues.
28 citations
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March 2012 in “Journal of The American Academy of Dermatology” Early hair loss may indicate prostate issues.
33 citations
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October 2004 in “Archives of Dermatological Research” Large prostate links to more hair loss, but age of onset doesn't affect it.
21 citations
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June 2002 in “PubMed” The conclusion is that there might be a link between certain types of baldness and prostate cancer, which could be due to shared hormonal pathways.
54 citations
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May 1998 in “Urology” Men with enlarged prostates often have more severe baldness.
1 citations
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January 2019 in “PubMed” Baldness score can't be used to predict prostate size.
January 2018 in “프로그램북(구 초록집)”
September 2017 in “Indian journal of health sciences and biomedical research KLEU” 
3 citations
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January 2015 in “DOAJ (DOAJ: Directory of Open Access Journals)” There's no link between hair loss type androgenic alopecia and benign prostatic hyperplasia, but early hair loss and family history can mean more severe alopecia.
