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What is IGM Nephropathy?

IgM is short for Immunoglobulin M, one of the types of antibody our body produces to fight infection. This circulates in the blood. Nephropathy is a scientific term for kidney disease.

In this condition, IgM settles in the kidney and causes scarring and inflammation within the kidney, which can only be seen clearly under the microscope. Therefore, it is normally only diagnosed after a biopsy test of the kidney. What doctors see under the microscope is that the “glomeruli”, which are the tiny structures which filter the blood to make urine, are damaged by deposits of IgM.

What are the symptoms of IGM Nephropathy?

These are variable from case to case. In most cases there are no symptoms, but the damage to the glomeruli causes some blood and/or protein to appear in the urine. This blood is often invisible, and only detected on routine medical check-ups. In other cases the blood may be visible, coming in attacks every so often. Normally this condition is quite painless. However, in some cases there may be some pain over the kidneys, often occurring in attacks after a viral infection.

What causes IGM Nephropathy?

Basically no-one knows fully. IgM is part of the body’s defence against infection. As the antibody travels around in the blood and passes through the kidney it can get deposited in the filters (glomeruli) and then can cause an inflammatory reaction. Doctors do not know why this happens, and unfortunately cannot stop it.

What will happen if I have IGM Nephropathy?

The outcome is very variable, and you will need to ask your specialist how things are likely to be in your case. The possibilities are:-

1. It may continue unchanged for many years, requiring only regular check-ups with blood tests. This is probably the case in a majority of patients.
2. It may go away on its own in some cases.
3. In occasional cases kidney failure develops, leading to the question of dialysis or transplantation.

What are the complications of IGM Nephropathy?

1. High blood pressure may develop. This damages the kidneys and puts a strain on the heart and the rest of the circulation. Therefore high blood pressure should be treated vigorously.
2. As noted above, kidney failure may sometimes occur. If so, it develops slowly, so you need not be concerned about a sudden change in your condition overnight.
3. There may be pain over the kidneys in a minority of cases.

Are there any treatments?

IgM nephropathy can be difficult to treat, and doctors often need to keep a close eye on how your kidneys are working.

The main treatment is to control blood pressure, as this helps protect the kidneys and slow down any damage. You may be given blood pressure medicines, even if your blood pressure is not very high. These medicines can also reduce protein loss in your urine, which helps protect the kidneys further.

Sometimes, doctors may try steroid medicines or other drugs that calm the immune system. This is because IgM nephropathy involves the body making antibodies that may harm the kidneys. However, these treatments do not always work for everyone and can have side effects, so your doctors will carefully decide what’s best for you.

In some cases, doctors may also suggest:

• A low-salt diet – to help control blood pressure and swelling.
• Regular blood and urine tests – to check how your kidneys are doing.
• Medicine to reduce swelling (like diuretics) if your body holds on to extra fluid.

Doctors are still researching new treatments for IgM nephropathy to find better and safer ways to help.

Can I lead a normal life with IGM Nephropathy?

In most cases this condition does not affect normal life in any way. There is no special diet that will make the disease go away or get worse. You can continue with physical exercise and sports quite safely. The condition does not generally run in families, so you need not worry about having children. However, if you are planning a pregnancy you should discuss this with a doctor familiar with looking after pregnant women with kidney problems.

There will be some queries if you apply for mortgages or life insurance, so plan ahead and be prepared to have your doctors asked to supply a medical report.

Last reviewed October 2025
Next review October 2028

Reviewed by Dr Oshini Shivakumar 'Specialist Renal Registrar'

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The National Kidney Federation cannot accept responsibility for information provided. The above is for guidance only. Patients are advised to seek further information from their own doctor.