Does protein in urine always mean kidney disease?
Apr 16, 2023
Source: Cainiu Health
Dr. Zhao Xinju
Introduction
The presence of protein in urine does not necessarily indicate kidney disease. Protein in urine may result from elevated body temperature, intense physical exercise, or being in the menstrual period for women, which are considered false positives. It could also be due to a urinary tract infection, where the body's inflammatory response to infection causes red blood cells, white blood cells, or other small-molecule proteins to leak into the urine. However, in most cases, protein in urine is caused by kidney diseases such as nephritis or nephrotic syndrome.
Under normal circumstances, protein in urine may be caused by kidney disease or other conditions. The specific analysis is as follows:
1. No
Protein in urine may result from elevated body temperature, intense physical exercise, or a woman being in her menstrual period, which constitutes a false positive. It could also occur due to urinary tract infections—when the body is infected and inflammation develops, red and white blood cells increase and the kidneys' filtration capacity decreases, allowing red blood cells, white blood cells, or other small-molecule proteins to leak into the urine.
2. Yes
In most cases, protein in urine is caused by kidney disease, such as nephritis, diabetic nephropathy, or nephrotic syndrome. It may be accompanied by symptoms like high blood pressure and body swelling. As the condition progresses, it may lead to impaired liver function and increased levels of creatinine and urea.
When protein is detected in urine, further related examinations are necessary to clarify the underlying condition and guide targeted treatment.
