Nephrotic syndrome
Nephrotic syndrome is a condition that causes the kidneys to leak large amounts of protein into the urine. This can lead to a range of problems, including swelling of body tissues and a greater chance of catching infections.
About nephrotic syndrome
Although nephrotic syndrome can affect people of any age, it's usually first diagnosed in children aged between two and five years old. It affects more boys than girls.
Symptoms of nephrotic syndrome
Symptoms of nephrotic syndrome include:
- severe swelling (oedema), particularly around the eyes, ankles and feet
- foamy urine - because of high levels of protein being passed into the urine (pee) sometimes it can cause it to become frothy/ foamy
- weight gain, due to excess fluid retention
- tiredness
When to see your GP
You should see your GP if you have the symptoms associated with nephrotic syndrome. It can usually be diagnosed with investigations that your GP can arrange for you.
Your GP will also probably refer you to a specialist for further investigation.
Problems caused by nephrotic syndrome
The problems caused by the condition include:
- blood clots
- infections
- loss of vitamin D leading to bone disease
- high cholesterol (hyperlipidaemia)
- acute renal failure
Blood clots
Important proteins that help to prevent the blood clotting can be passed in the urine. This can increase the risk of potentially serious blood clots. During a relapse, the blood also becomes more concentrated, which can lead to clotting.
Infections
People with nephrotic syndrome are prone to infection, due to loss of proteins that help fight them, such as IgG, and because of the immune system not working as well as usual, so infections need to be treated early and with strong antibiotics.
Nephrotic syndrome in children
Most children with nephrotic syndrome have times when their symptoms are under control (remission), followed by times when symptoms return (relapses).
In most cases, relapses become less frequent as they get older and often stop by their late teens.
Nephrotic syndrome in adults
In adults, the outlook is more variable, depending on the cause.
Remission occurs less often but does occur.
In adults, there is an increased risk of mortality due to the complications of infection and clots (thromboembolism).
Causes of nephrotic syndrome
Nephrotic syndrome can sometimes occur as a result of a kidney problem or another condition, including:
- glomerulosclerosis – when the inside of the kidney becomes scarred
- glomerulonephritis – inflammation inside the kidney
- an infection – such as HIV or hepatitis
- lupus
- diabetes
- amyloidosis
- sickle cell anaemia
- in very rare cases, certain types of cancer, such as leukaemia, multiple myeloma or lymphoma
It has also been found to sometimes be linked to taking some medication, including:
- gold
- some antibiotics
- nonsteroidal anti-inflammatory drugs (NSAIDs)
- penicillamine
- lithium
Managing nephrotic syndrome
As there are many causes of nephrotic syndrome, your treatment will depend on what is causing the condition. If it is possible to treat the cause, suitable treatment will be recommended.
Treatment may be given to control the symptoms, such as steroid medication to reduce inflammation or diuretics, ('water tablets') to reduce the fluid build-up.
The health professional looking after your care will discuss with you the most appropriate treatment options.
More useful links
The information on this page has been adapted from original content from the NHS website.
For further information see terms and conditions.