Minimal change disease

Overview

Minimal change disease is a kidney condition where the tiny filters in your kidneys (called glomeruli) are temporarily damaged, causing protein to leak into your urine. This leads to swelling in the body, especially around the eyes and ankles.

Minimal change disease is not very common overall, but it is the leading cause of nephrotic syndrome in children aged 2 to 6 years.

It mostly affects young children, especially between ages 2 and 6, but it can also occur in older children and adults of any age.

Symptoms

Common symptoms

• Swelling around the eyes, especially in the morning
• Swelling in the ankles and feet
• Foamy or bubbly urine
• Weight gain from fluid retention

Symptoms in children

• Puffiness around the eyes
• A swollen belly (ascites)
• Decreased urine output
• Tiredness and irritability

Symptoms in older adults

• More pronounced swelling in the legs and abdomen
• Feeling very tired (fatigue)
• Higher risk of infections and blood clots

Causes

Main causes

• The exact cause is unknown, but it is thought to be related to an immune system response that temporarily damages the kidney's filters.
• It often happens after an infection, an allergic reaction, or sometimes after a vaccination.

Risk factors

• Being a young child (ages 2 to 6)
• Recent upper respiratory infection or other illness
• Having certain allergies
• Rarely, a family history of the condition

When to see a doctor

See a doctor urgently if:

• If you or your child notice swelling around the eyes, ankles, or belly that appears suddenly
• If you see foamy or bubbly urine
• If urine output drops significantly

Book a routine appointment if:

• If you have mild puffiness that comes and goes
• If unexplained weight gain happens over a few days

Diagnosis

A doctor will diagnose minimal change disease by checking for protein in your urine and measuring the levels of protein in your blood. A kidney biopsy (taking a tiny piece of kidney tissue) may be needed to confirm the diagnosis.

Tests that may be done

• Urine dipstick test – to check for protein
• Blood test – to check levels of albumin (a protein) and creatinine (a waste product)
• Kidney biopsy – a thin needle is used to take a small sample of kidney tissue for examination

What to expect at your appointment

Your doctor will ask about your symptoms and examine you. A kidney biopsy is usually done with a local anaesthetic and you may go home the same day. The results help confirm the condition and guide treatment.

Treatment

Treatment aims to reduce the protein leak and control swelling. The main treatment is a course of corticosteroid medication. Other medicines may be used if the disease does not respond or comes back.

Self-care at home

• Reduce salt in your diet to help control swelling
• Weigh yourself daily to check for fluid retention
• Rest when you feel tired, especially during flare-ups
• Avoid contact sports or activities that could cause injury while on steroids

Medical treatments

Doctors usually prescribe oral corticosteroids (like prednisolone) for several weeks to stop the protein leak. If the disease relapses or does not respond, other medications that affect the immune system may be used. These are taken under close medical supervision.

When is surgery considered?

Surgery is not a treatment for minimal change disease.

Living with this condition

Manage swelling by limiting salt intake and taking medicines as prescribed. Watch for signs of relapse, such as swelling or foamy urine. Keep up with regular check-ups to monitor kidney function.

Lifestyle tips

• Stay active with gentle exercise like walking, but rest when swelling is present
• Maintain a healthy weight to reduce pressure on your kidneys
• Avoid smoking and limit alcohol

Diet and exercise

Eat a low-salt diet to help manage fluid retention. Include moderate amounts of protein. Gentle exercise, such as walking or swimming, is fine when you feel well. Always talk to your doctor before starting a new exercise routine.

Mental health and emotional wellbeing

Living with a kidney condition can be stressful, especially for children and their families. It’s normal to feel worried or anxious. Talking to a counsellor or joining a support group can help you cope.

Prevention

There is no known way to prevent minimal change disease because the exact cause is not fully understood.

Vaccines

Children with minimal change disease should receive all routine vaccinations. However, live vaccines (like the MMR or chickenpox vaccine) may need to be delayed during treatment with high-dose corticosteroids. Discuss vaccinations with your doctor.

Screening programmes

There is no routine screening for minimal change disease. It is usually discovered when symptoms appear.

Complications

If left untreated

• Severe fluid overload in the body, leading to breathing problems
• Increased risk of serious infections
• Blood clots in the legs or lungs (less common)
• Permanent kidney damage (rare)

Long-term outlook

The outlook for most people with minimal change disease is very good. Most children and adults respond well to treatment and the disease goes into remission (no active symptoms). Some people may have relapses, but these can usually be treated successfully again. With proper care, long-term kidney function is usually preserved.

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