IgM is short for Immunoglobulin M, one of the types of antibody the body produces to fight infection. This circulates in the blood. “Nephropathy” is a scientific term for kidney disease.
There is scarring and inflammation within the kidney, that 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.
Click here for more information on what causes Glomerulonephritis.
These are variable from case to case. In most cases there are no symptoms, but the damage to the glomeruli causes some blood 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.
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.
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:-
This is not an easy condition to treat, and usually doctors rely on treatment of the blood pressure. Because the condition is caused by antibodies treatments to reduce antibody production might be logical. However the drugs used for this have many side effects, and such treatment is very experimental.
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. 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.
NKF Controlled Document No. 285, IgM Nephropathy, written 2 December 2000. Last reviewed 6 June 2011.
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.