Nephrotic syndrome happens when the kidneys let protein leak into the urine. When this happens, there is not enough protein in the blood. Low protein in the blood allows fluid to leak out of the blood stream and into body tissues.
Nephrotic syndrome is a collection of the following signs: High protein in the urineLow protein in the bloodSwelling of body tissuesHigh cholesterol
in the blood
Nephrotic syndrome is not a disease itself. It is a set of signs and symptoms that indicate that another disease has damaged the kidneys, and that they are no longer working properly.
Nephrotic syndrome is caused by damage to tiny filters in the kidneys, called glomeruli. The glomeruli filter waste and excess water from the blood. This forms urine, which reaches the bladder via the ureters. Diseases that damage the glomeruli cause nephrotic syndrome.
Anatomy of the Kidney
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Diseases that may lead to nephrotic syndrome include: Glomerulonephritis—inflammation of the glomeruli from infection or other causes
Diabetic nephropathy—kidney complications from diabetesMembranous nephropathyIgA nephropathyMembranoproliferative glomerulonephritis
amyloidosis—abnormal protein deposits in the kidneys
Minimal change disease
Other diseases, including
systemic lupus erythematosus, certain infections, toxins,
sickle cell disease, renal vein thrombosis, and some types of cancer
Tell your doctor if you have any of the following factors that increase your risk of nephrotic syndrome: DiabetesLupusExposure to drugs or toxinsCertain infections
Symptoms may include:
Swelling around the following body parts:
FeetAnklesAbdomenHandsFaceEyesWeight gain from excess fluidsShortness of breathPoor appetiteFoamy urineFatigue
Your doctor will ask about your symptoms and medical history. A physical exam will be done.
High blood pressure
may indicate kidney damage. A urine test will show if you have too much protein or any blood
in your urine. A blood test will show if your blood contains too much cholesterol and not enough protein.
Your bodily fluids and tissues may be tested. This can be done with: Blood testsUrine testsBiopsy
Images may need to be taken of your bodily structures. This can be done with: CT scanMRIUltrasound
If your doctor suspects nephrotic syndrome, you may be referred to a kidney specialist.
Treatment depends on what is causing the nephrotic syndrome. Some cases are treatable with medicine, while others lead to kidney failure despite treatment. The underlying cause will be treated, if possible. Steps will be taken to: Adjust your diet to replace protein lost in the urineUse ACE inhibitors to reduce protein loss in some casesTreat edema by restricting salt intake and taking diuretics, also known as water pillsLower cholesterol and blood pressure with diet, exercise, and medicines
Most conditions that lead to nephrotic syndrome cannot be prevented. However, the risk of
type 2 diabetes
may be reduced through exercise and weight control.
Last reviewed July 2013 by Adrienne Carmack, MD; Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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