Has a doctor ever told you that you just have too much blood? Probably not, but there are a handful of conditions where being a little low might be good for you.
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Sources:
https://www.nationalgeographic.com/science/phenomena/2015/10/27/bloodletting-is-still-happening-despite-centuries-of-harm/
https://bmcmedicine.biomedcentral.com/articles/10.1186/1741-7015-10-54
http://www.nbcnews.com/id/5319129/ns/health-health_care/t/fda-approves-leeches-medical-devices/#.W32pq8knaUk
https://www.bcmj.org/premise/history-bloodletting
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3934278/
http://www.rcpe.ac.uk/sites/default/files/thomas_0.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2732125/
https://www.ncbi.nlm.nih.gov/pubmed/18612130
https://www.ucsfhealth.org/education/hemoglobin_and_functions_of_iron/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2516548/
https://www.sciencedirect.com/science/article/pii/S1937644815000623?viaihub
https://www.ncbi.nlm.nih.gov/pubmed/8836013
https://www.niddk.nih.gov/health-information/liver-disease/viral-hepatitis/hepatitis-c
https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0026097/
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Images:
https://commons.wikimedia.org/wiki/File:12xx_Schale_mit_Aderlass-Szene_Iran_13._Jht._anagoria.JPG
https://commons.wikimedia.org/wiki/File:Bronze_cupping_vessel,_Egypt,_300_BCE-300_CE_Wellcome_L0058045.jpg
https://commons.wikimedia.org/wiki/File:Medicine_aryballos_Louvre_CA1989-2183.jpg
https://commons.wikimedia.org/wiki/File:Blood_letting.jpg
https://en.wikipedia.org/wiki/File:Horn_fleam.JPG
https://wellcomecollection.org/works/tskck7ts?query=leeches&page=1
https://wellcomecollection.org/works/xz3ca22v?query=bleeding&page=1
https://wellcomecollection.org/works/jrktze3n?query=V0011195&page=1
https://www.istockphoto.com/vector/young-people-donates-blood-gm896337482-247534352
https://www.istockphoto.com/photo/red-blood-cells-in-vein-gm637422184-113717659
https://commons.wikimedia.org/wiki/File:1911_Sickle_Cells.jpg
https://commons.wikimedia.org/wiki/File:Sickle_cells.jpg
https://www.istockphoto.com/vector/abstract-background-with-blood-bag-gm646501406-117252717
https://www.istockphoto.com/photo/hirudotherapy-medical-leeches-gm635767330-112393283
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