Protein in the urine detected by a urine sample is abnormal. The most common cause of this finding is diabetes, after having been present for some period of time.
Other causes of protein in the urine may be benign related to exercise, simply standing, or fever.
Other causes of protein in the urine that are more worrisome are autoimmune diseases where the body attacks itself by damaging its organs.
A kidney biopsy is often required when protein in the urine occurs in large amounts with a handful of blood tests.
Often steroids are part of the treatment plan to treat findings on the renal biopsy though not always. Other treatment may include blood pressure control, treating an underlying disease, or very strong medication such as is used for chemo