Fair question SLS. I have written over 400 articles here on Medium about my personal transgender experience that you can read. If you want to get more clinical answers, I suggest these sites:

https://www.nhs.uk/conditions/gender-dysphoria/symptoms/

https://www.apa.org/topics/lgbtq/transgender-people-gender-identity-gender-expression

https://www.mayoclinic.org/healthy-lifestyle/adult-health/in-depth/transgender-facts/art-20266812

https://www.psychiatry.org/patients-families/gender-dysphoria/expert-q-and-a