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Nephrotic syndrome — heavy proteinuria, edema, low albumin, high cholesterol. What it is, the causes that underlie it, and the complications that make it dangerous.
Evidence reviewed & updated: 2026-08 — reflects the latest published trials and guidelines.
Nephrotic syndrome is a clinical picture, not a single disease: heavy proteinuria (>3.5 g/day), low albumin, edema, and high cholesterol. The underlying causes — minimal change, FSGS, membranous nephropathy, diabetic nephropathy — determine treatment. The syndrome itself carries real dangers: blood clots, infections, and acute kidney injury.
Nephrotic syndrome is defined by the tetrad: proteinuria above 3.5 g/day, serum albumin below 3 g/dL, edema, and hyperlipidemia. It's a presentation — the underlying disease is found by biopsy and serology: in children it's usually minimal change disease; in adults, FSGS, membranous nephropathy, diabetic nephropathy, amyloidosis, or lupus nephritis.
The protein leak itself drives the complications: the body loses albumin and anticoagulant proteins while the liver overproduces clotting factors and cholesterol.
Thrombosis is the headline risk: nephrotic patients have a several-fold higher clotting risk, and renal vein thrombosis is a classic — flank pain, hematuria, rising proteinuria. Anticoagulation is considered when albumin falls below ~2-2.5 g/dL, balanced against bleeding risk.
Infections: immunoglobulins are lost in urine — risk rises further on steroids. Acute kidney injury can complicate nephrotic syndrome, especially in adults with MCD and in older patients. Chronic proteinuria also drives progressive kidney damage — the reason proteinuria itself is treated.
Treatment has three tracks: (1) treat the cause — steroids for MCD, immunosuppression for FSGS/membranous/lupus, glucose control for diabetic nephropathy; (2) kidney-protective therapy for everyone — ACEi/ARB, SGLT2 inhibitors, BP control, sodium restriction, moderate protein; (3) manage complications — diuretics for edema, anticoagulation when indicated, statins, infection vigilance.
Edema management: sodium restriction first, then loop diuretics; albumin infusions are reserved for specific indications. The outlook depends entirely on the underlying disease and its response.
Minimal change disease (MCD) is the most common cause of nephrotic syndrome in children — and it's the most steroid-resp...
Learn moreFSGS is a pattern of kidney injury where patches of the glomeruli (filters) scar — it's a leading cause of nephrotic syn...
Learn moreMembranous nephropathy is the most common cause of nephrotic syndrome in adults — immune deposits thicken the glomerular...
Learn moreLupus nephritis is kidney involvement in systemic lupus erythematosus — about half of lupus patients develop it, and it'...
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