Changes in urine:

Urine production is the responsibility of the kidneys, as no change in the appearance, odor or frequency of urine can be ignored. Three of the common changes are:

First, present a foamy or bubble urine, which could indicate the presence of unwanted proteins; second, an increase in urination frequency, especially at night, the normal thing is to urinate between four and ten times a day; and third, presence of blood in the urine, this could indicate that the kidney filter is damaged, since the blood cells could be transferred, because the waste from the urine is not being filtered correctly.

Here are other signs that show that your kidneys are not working properly

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