Some signs that you may have kidney disease are trouble concentrating, you have less energy than before or are tired all the time.
Having anemia is also a complication that can lead to kidney disease so if you're anemic then you have a high chance of developing kidney disease in your future so always get checked regularly.
Although kidney disease can't be cured if you catch the kidney disease in time and get on dialysis or have a kidney transplant then you stand a higher chance of living longer.
Your doctor can draw some blood from you and test your blood for build up of toxins.
When your kidneys are not functioning properly and not filtering out those toxins then the toxins will show up in a blood test indicating kidney failure.
Those toxins must be removed from your blood in order for you to survive and that's where the dialysis machine comes in to filter your blood and remove those toxins so you can survive.