National Geographic reports that Roundup may account for billions of USD in healthcare costs. Some of the problems that glyphosate is suspected to cause, supported by study correlation, are kidney and liver damage, imbalances in the intestinal microbiome and
intestinal functioning, cancer, genotoxicity, endocrine disruption,
reproductive and developmental reduction, neurological damage, and
immune system dysfunction. Glyphosate is thought to block or mimic hormones causing hormone-related problems. Even the Endocrine Society
says EDCs (some pesticides act as an EDC) are a danger.(Their page has recent studies on how chemicals act as EDCs and their adverse effects.)
The researchers detailed the costs related to three types of conditions: neurological effects, such as attention deficit disorders; obesity and diabetes; and male reproductive disorders, including infertility. The researchers concluded that there is a
greater than 99 percent chance that endocrine-disrupting chemicals are
contributing to the diseases...
Some common EDCs that are known to cause problems:
bisphenol-A (BPA), used in hard plastics, food-can linings, and paper receipts; two phthalates used as plasticizers in vinyl products;
DDE, the breakdown product of the banned insecticide
DDT;
organophosphate pesticides, including one called
chlorpyrifos used on grain, fruit, and other crops; and
brominated flame retardants known as PBDEs that were extensively used in furniture foams until they were banned in Europe and the United States.
Sources
NatGeo.
See this study from Andrology by L. Trasande.
This Google Scholar search shows studies showing issues affecting healthcare costs in Europe.
PDF of similar paper from env-health.org. 25 pages.