It is better to know the risk factors for kidney damage rather than try to identify when your kidney is going to fail.
Diabetes, some drugs, dehydration and certain infections can cause the kidneys to fail. So if you've got any risk factor get your kidney function tested.
In the end stages - urine output is reduced, swelling of feet or of the entire body can develop and basically the body starts to retain the toxic products which the kidney would normally get rid of.
the brain
Yes. But there are even more painful options.
You have spelled it correctly, dying.
i do not know :(
you die ;)
Yes
I cannot know.
I don't know that they're the main organs, but kidneys are certainly essential to the urinary system.
I really dont know.
painfully pass blood and stones
by dying then you know if its a risk
A person without kidneys that is not on dialysis may only live from a few days to several weeks before dying.