The kidneys have a very strong compensatory ability. When kidney function is slightly impaired, many people do not have any uncomfortable symptoms and feel everything is normal. However, if one actively seeks out early signs, it is possible to detect precursors to kidney failure. At this time, if one can go to the hospital in time for routine blood tests, urine tests, and kidney function tests, it is possible to determine if there is kidney failure. The most obvious precursor symptom of kidney failure is usually general fatigue, which many people tend to overlook. This is because there are indeed many reasons that can cause fatigue, especially since many people attribute it to fatigue or stress factors. Additionally, many patients with precursors to kidney failure experience edema, particularly the kind that disappears after rest, so it is especially not taken seriously. Another symptom of kidney failure precursors is a significant increase in the frequency of urination at night, which is also often overlooked.