So why does kidney disease kill so many Indians? Drag the function down and watch what your body tells you.
Your body is saying nothing. The test already knows.
You were built with roughly twice the kidney capacity you need. That spare is why donating one works. It is also why kidney disease is so dangerous. You can lose well over half your function and feel nothing at all, because the part that remains quietly covers for the rest. Nothing hurts. Nothing swells. The damage is real the whole time.
A simple blood test and urine test find this years before your body mentions it. In India the two largest causes of kidney damage are diabetes and high blood pressure, and both of those are silent too. Three silent things stacked on each other is how someone ends up surprised by news that took a decade to arrive.
This explains how the body works. It is not medical advice, not a diagnosis, and not a substitute for seeing a doctor. If something feels wrong, see one.