Yes, frequent and sometimes serious infections are a common complication of nephrotic syndrome. People with this condition are considered ‘immunocompromised’, meaning their immune system is less effective at fighting off bacteria and viruses. This increased vulnerability occurs because the kidneys are not just leaking waste products; they are also losing essential proteins that the body uses to defend itself against illness.
In the UK, preventing and managing infections is a top priority for patients with nephrotic syndrome. Infections are not only a health risk in themselves but are also one of the most common triggers for a ‘relapse’, where the protein leak suddenly worsens. Understanding why this happens and knowing the early warning signs of an infection can help patients seek treatment quickly, reducing the risk of a hospital admission and helping to keep the kidney condition stable.
What We’ll Discuss in This Article
- Why losing protein in the urine weakens the immune system.
- The role of ‘immunoglobulins’ in fighting bacteria.
- Common types of infections seen in nephrotic patients, such as peritonitis.
- How medications like steroids can further impact infection risk.
- The link between infections and nephrotic relapses.
- Practical UK-based advice on vaccinations and hygiene.
Why nephrotic syndrome weakens the immune system
The primary reason for the high infection risk is the loss of specialized proteins called immunoglobulins (antibodies) in the urine. Immunoglobulins are the ‘soldiers’ of the immune system; they circulate in the blood and identify and neutralize harmful invaders like bacteria and viruses.
In nephrotic syndrome, the kidney filters are so porous that these large immunoglobulin proteins escape the blood and are flushed out of the body. As the levels of these antibodies drop, the body becomes slower and less effective at responding to new infections. Additionally, the fluid buildup (oedema) in the tissues can act as a breeding ground for bacteria, particularly in the skin or the lining of the abdomen.
Common types of infections to watch for
Patients with nephrotic syndrome are prone to specific types of infections. In the UK, clinicians closely monitor patients for signs of:
- Cellulitis: A bacterial skin infection that often occurs in the legs or ankles where the swelling is most severe. The skin may become red, hot, and painful.
- Peritonitis: An infection of the fluid in the abdominal cavity (ascites). This is a serious condition characterized by sudden abdominal pain, fever, and vomiting.
- Pneumonia: Respiratory infections can be more frequent and severe due to a weakened immune response.
- Urinary Tract Infections (UTIs): High levels of protein in the urine can sometimes encourage the growth of bacteria in the bladder.
| Infection Type | Common Signs | Why it Happens |
| Cellulitis | Red, hot, swollen skin | Bacteria entering through stretched skin |
| Peritonitis | Severe stomach pain, fever | Bacteria growing in retained abdominal fluid |
| Upper Respiratory | Cough, sore throat, fever | Loss of protective antibodies (IgG) |
| UTI | Stinging when peeing, cloudy urine | Protein in urine acting as a food source for bacteria |
The impact of medication on infection risk
The medications used to treat nephrotic syndrome in the UK, such as prednisolone (steroids) or other immunosuppressants (like ciclosporin or tacrolimus), work by ‘quieting’ the immune system to stop it from attacking the kidney filters. While this is necessary to treat the syndrome, it also makes it even harder for the body to fight off external germs.
Because of this ‘double risk’ the loss of antibodies and the effect of medication patients are often advised to take extra precautions. This includes avoiding close contact with people who have contagious illnesses like chickenpox or measles, as these can be much more severe for someone with nephrotic syndrome.
Infections as a trigger for relapses
There is a complex ‘circular’ relationship between infections and nephrotic syndrome. While the syndrome makes infections more likely, an infection (even a mild cold) can trigger the immune system in a way that causes the kidneys to leak even more protein.
In the UK, many parents of children with nephrotic syndrome notice that their child’s urine becomes frothy or shows protein on a dipstick test just as they are coming down with a cough or cold. Managing the infection quickly is often the key to bringing the kidney ‘flare’ back under control.
Nephrotic vs. Nephritic Infection Risks
While both conditions involve the kidneys, the risk profile for infection is usually much higher in nephrotic syndrome due to the massive protein loss.
| Feature | Nephrotic Infection Risk | Nephritic Infection Risk |
| Antibody Loss | High (leaking IgG in urine) | Low |
| Medication Impact | High (long-term steroids) | Moderate (acute treatment) |
| Typical Trigger | Infection causes a relapse | Infection often precedes the syndrome |
| Main Concern | Peritonitis and skin infections | Post-streptococcal inflammation |
To Summarise
Frequent infections are common in nephrotic syndrome because the body loses vital immune-fighting proteins in the urine. The risk is further increased by the medications used to treat the condition. Infections are serious because they can cause the kidney condition to relapse. UK patients are encouraged to stay up to date with vaccinations, practice good hygiene, and seek medical help immediately if they develop a fever or severe pain.
If you experience severe, sudden, or worsening symptoms, such as high fever, severe abdominal pain, or difficulty breathing, call 999 immediately.
Why does a simple cold cause a relapse?
The immune system’s response to the cold virus can mistakenly trigger the kidney filters to open up, allowing protein to leak through again.
Should I avoid the flu vaccine?
No, in the UK, the annual flu vaccine is highly recommended for nephrotic patients, though the ‘live’ version (the nasal spray) may be avoided if you are on certain immunosuppressants.
What is the most dangerous infection for nephrotic patients?
Peritonitis (infection in the abdomen) is considered a medical emergency and needs immediate hospital treatment.
Can I travel abroad if I have this condition?
Can IYes, but you should discuss it with your specialist first, as you may need extra vaccinations or a ‘rescue pack’ of antibiotics to take with you.
Do children with nephrotic syndrome need to stay off school?
Not usually, but they should stay home if there is an outbreak of a serious contagious illness like chickenpox or if they are feeling unwell themselves.
Is it safe to use hand sanitiser?
Yes, good hand hygiene is one of the best ways to reduce the risk of picking up viral and bacterial infections.
Authority Snapshot
This article was reviewed by Dr. Stefan Petrov, a UK-trained physician with experience in general medicine and emergency care. The information provided is in line with NHS and NICE clinical guidance regarding the immunocompromised status of patients with glomerular disease. Our goal is to help patients understand their increased risk of infection and the importance of proactive preventative care within the British healthcare system.
