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Minimal Change Disease

The most common cause of nephrotic syndrome in children — kidney filters leak protein despite looking nearly normal under a regular microscope.

What it is

The glomeruli (kidney filters) become leaky and allow large amounts of protein — especially albumin — to spill into the urine. Low albumin in the blood then draws fluid into the tissues, causing swelling. MCD is the underlying cause in about 80% of children with nephrotic syndrome.

Why "Minimal Change"?

Under a standard light microscope, kidney tissue looks almost normal. The damage — flattening of tiny foot-like projections on filter cells (podocyte foot process effacement) — is only visible under an electron microscope. That's the "minimal change" the name refers to.

How common

About 2–7 new cases per 100,000 children each year. It's most common between ages 2 and 6, more often in boys than girls in young children. It can also occur in adults, though less commonly.

Symptoms to watch

Puffy eyes (especially mornings), swollen ankles, belly, or hands, rapid weight gain from fluid, foamy urine, high blood pressure, fatigue, and higher risk of infection. Symptoms can appear suddenly over a few days.

Treatment options

Corticosteroids (prednisone or prednisolone) are first-line — 80–90% of children respond within 4–8 weeks. Diuretics and a low-sodium diet help manage swelling. If relapses are frequent or steroids cause side effects, steroid-sparing medicines (cyclosporine, tacrolimus, mycophenolate) may be added.

Steroid response & relapses

MCD typically responds well to steroids — this is one of its distinguishing features. However, relapses are common, affecting roughly 60–70% of children after their first remission. Families monitor protein at home with urine dipsticks. Relapse signs guide →

Minimal Change Disease

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Frequently asked questions

Why is it called Minimal Change Disease?

Under a standard light microscope, the kidney tissue looks almost normal — hence "minimal change." The actual damage (flattening of filter cell foot processes) is only visible under an electron microscope. Despite the subtle appearance, the kidneys are leaking significant amounts of protein.

What is the difference between MCD and FSGS?

Both cause nephrotic syndrome, but FSGS involves visible scarring of the glomeruli and is often steroid-resistant. MCD typically responds well to steroids and rarely causes permanent kidney damage. A kidney biopsy can distinguish between them — biopsies are sometimes recommended when steroids don't work or in older children and adults.

How common are relapses, and will they become less frequent?

About 60–70% of children with MCD relapse at least once. Some relapse frequently in the early years. The good news is that many children relapse less often as they grow older, and a significant proportion achieve long-term remission by adolescence or early adulthood.

Will MCD damage my child's kidneys permanently?

In most children, MCD does not cause lasting kidney damage. Unlike some other kidney diseases, MCD rarely progresses to chronic kidney disease when managed appropriately. Regular follow-up with a nephrologist is still important, especially during active relapses.

Can MCD occur in teenagers and adults?

Yes. MCD can occur at any age. In adults, it is less common relative to other causes of nephrotic syndrome and sometimes has an underlying trigger (certain medications, cancer, or infections). The workup and treatment are similar, though adult onset may prompt a kidney biopsy more readily than in young children.