nephritis flare ups

Overview

Nephritis is a condition that causes the kidneys to become swollen and irritated, called inflammation. A flare-up means the inflammation suddenly gets worse. This can make your kidneys work less well for a while. The good news is that flare-ups can often be treated, and many people feel better with the right care.

Nephritis is not rare, but it is not as common as other kidney problems like kidney stones. Flare-ups happen most often in people who already have a long-term kidney condition, such as IgA nephropathy or lupus nephritis.

Nephritis can affect people of any age, but it is more common in young adults and men. Some types run in families. It can also appear in children, especially after a throat or skin infection.

Symptoms

Common symptoms

• Pink or cola-colored urine (blood in the urine)
• Frothy or bubbly urine (protein in the urine)
• Puffiness or swelling in your face, hands, legs, or feet
• Feeling very tired or weak
• High blood pressure
• Needing to urinate less often than usual
• A dull ache in your back or side

Symptoms in children

• Swelling around the eyes, especially in the morning
• A fever
• Poor appetite or nausea
• Less energy than usual
• Peeing less often or having dark urine

Symptoms in older adults

• Confusion or feeling unusually sleepy
• Less obvious swelling, but shortness of breath
• High blood pressure that is hard to control
• Feeling generally unwell without clear symptoms

Causes

Main causes

• An immune system problem, where your body's defense system attacks your own kidneys (autoimmune disease)
• An infection, such as a throat infection or a skin infection, that triggers kidney inflammation
• A reaction to certain medicines or substances (but avoid naming specific drugs – you can say 'some over-the-counter pain relievers or certain antibiotics')
• Sometimes the cause is not known

Risk factors

• Having a family history of kidney disease or autoimmune disease
• Having a condition like lupus, or a type of kidney disease called IgA nephropathy
• A recent infection
• Being a young adult or male (some types are more common in these groups)

When to see a doctor

See a doctor urgently if:

• You notice blood in your urine or your urine becomes very dark
• You have swelling that doesn't go away or gets worse
• You feel extremely tired or confused
• You are producing much less urine than normal

Book a routine appointment if:

• You have ongoing puffiness, high blood pressure, or frothy urine
• You have a condition like lupus or diabetes and notice any new symptoms
• You've had a recent infection and then develop these symptoms within a few weeks

Diagnosis

Your doctor will ask about your symptoms, examine you, and order tests. Nephritis is diagnosed by looking at your urine and blood, and sometimes by taking a tiny sample of kidney tissue (a biopsy) to see the inflammation clearly.

Tests that may be done

• Urine test (to check for blood, protein, and signs of infection)
• Blood test (to check how well your kidneys are filtering waste, called GFR, and to look for markers of inflammation)
• Ultrasound or CT scan (to get a picture of your kidneys)
• Kidney biopsy (a small needle sample, done under local anaesthetic, to examine the tissue under a microscope)

What to expect at your appointment

You may need to see a kidney specialist (nephrologist). The biopsy is quick and usually done as a day case. You'll have a small bruise, but most people recover the same day. Results take about a week, and your doctor will explain what they mean.

Treatment

Treatment for a flare-up aims to calm the inflammation, protect your kidney function, and manage symptoms like swelling and high blood pressure. The right approach depends on what's causing the flare-up and how severe it is.

Self-care at home

• Rest more than usual to give your body energy to heal
• Drink only the amount of fluid your doctor recommends – don't force extra fluids
• Limit salt to help reduce swelling and blood pressure (your doctor or dietitian can advise)
• Take over-the-counter pain relievers only if your doctor approves – some can harm the kidneys

Medical treatments

Doctors may prescribe medicines to calm the immune system, such as corticosteroids or other immunosuppressants (these are strong, prescription-only medications). They may also give medicines to lower blood pressure, usually a class called ACE inhibitors or ARBs (your doctor will explain why these help the kidneys). In some cases, a course of antibiotics is needed if infection triggered the flare-up. Always take medicines exactly as prescribed and never stop without talking to your doctor.

When is surgery considered?

Surgery is rarely needed for a nephritis flare-up. If the kidneys fail completely, you might need dialysis or a kidney transplant, but this is only for very severe cases and happens over a long time, not during an acute flare.

Living with this condition

Living with nephritis means paying attention to your body and working closely with your healthcare team. Many people go through periods of remission (no symptoms) and flares. Learn your early warning signs, keep your appointments, and take your medicines regularly.

Lifestyle tips

• Check your blood pressure at home if your doctor suggests it
• Avoid non-steroidal anti-inflammatory drugs (NSAIDs) unless your doctor says they're safe
• Get enough sleep and manage stress to help your immune system stay calm
• Avoid infections by washing hands often and keeping up with vaccinations

Diet and exercise

What you eat matters. A diet low in salt, low in processed foods, and moderate in protein can reduce strain on your kidneys. Work with a dietitian to find the right balance for your stage of kidney disease. Gentle exercise, like walking, is good for your heart and can help you feel better, but avoid intense workouts during a flare.

Mental health and emotional wellbeing

It's completely normal to feel anxious, sad, or frustrated when dealing with a chronic condition like nephritis. Flare-ups can be stressful because they're unpredictable. Talk to your doctor about how you're feeling – support is available.

Prevention

You cannot always prevent a nephritis flare-up, especially if it's caused by an autoimmune condition. But you can reduce the chances by treating infections early, taking your prescribed medicines, keeping your blood pressure in a healthy range, and avoiding medicines that can irritate your kidneys.

Vaccines

Keep up to date with recommended vaccines, like the flu and pneumonia vaccines, because infections can trigger flare-ups. Talk to your doctor about which vaccines are right for you.

Screening programmes

If you have a condition that raises your risk, like lupus or diabetes, your doctor will check your urine and blood regularly to catch kidney problems early. Attend all routine check-ups.

Complications

If left untreated

• Worsening kidney function, leading to chronic kidney disease
• Severe swelling that makes it hard to breathe
• Dangerously high blood pressure
• A higher risk of kidney failure, needing dialysis or a transplant

Long-term outlook

The outlook for most people with nephritis is positive. With proper treatment, many flare-ups settle down and your kidneys can recover their function, sometimes completely. Some people may have repeated flare-ups, but good medical care and healthy habits can keep your kidneys working well for years. Research is always improving treatments, and there is every reason to be hopeful.

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