Glomerulonephritis

Glomerulonephritis is a kidney disease where the tiny filters in your kidneys, called glomeruli, become inflamed and damaged. These filters are essential for cleaning your blood and removing waste and extra fluid from your body. When they don't work correctly, waste can build up, leading to serious health problems if not treated.

What is Glomerulonephritis?

Glomerulonephritis is a condition where the glomeruli, which are the tiny filtering units within your kidneys, become inflamed and damaged. These filters are crucial for removing waste products and excess fluid from your blood to produce urine. When the glomeruli are inflamed, they cannot filter blood effectively, leading to a buildup of waste and fluid in your body.

Your kidneys are vital organs that perform many important functions, including filtering waste from your blood. Each kidney contains millions of tiny filters called glomeruli. These glomeruli act like a sieve, allowing waste products and excess water to pass through into the urine, while keeping important substances like proteins and blood cells in your body. When you have glomerulonephritis, these delicate filters become swollen and scarred. This damage can happen suddenly (acute glomerulonephritis) or develop slowly over many months or years (chronic glomerulonephritis). The severity of the condition can vary greatly, from mild inflammation that resolves on its own to severe damage that can lead to kidney failure. Because the glomeruli are damaged, they may start to let important substances, like protein and red blood cells, leak into your urine. At the same time, they may not remove waste products and excess fluid as efficiently. This imbalance can cause a range of symptoms and complications throughout your body.

Symptoms

Symptoms of glomerulonephritis can vary widely depending on whether the condition is acute or chronic, and how severe the kidney damage is. Common signs include blood in your urine, foamy urine due to protein, swelling in your face, hands, feet, or abdomen, and high blood pressure (hypertension).

Many people with chronic glomerulonephritis may not have noticeable symptoms in the early stages. The condition might be discovered during routine blood or urine tests. However, as the damage progresses, symptoms often become more apparent. Key symptoms to watch for include: * **Pink or cola-colored urine (hematuria):** This is caused by red blood cells leaking into your urine. It can be a sign of kidney damage. * **Foamy urine (proteinuria):** This happens when too much protein leaks from your blood into your urine. The foam is similar to what you see when beating egg whites. * **Swelling (edema):** You might notice swelling in your face, especially around your eyes, or in your hands, feet, and abdomen. This is due to your kidneys not removing enough fluid from your body. * **High blood pressure (hypertension):** Damaged kidneys can struggle to regulate blood pressure, leading to an increase. Other possible symptoms can include fatigue, reduced urine output, nausea, vomiting, headaches, and muscle cramps. In severe cases, or if kidney function declines significantly, more serious symptoms related to kidney failure can develop.

Causes & risk factors

Glomerulonephritis can be caused by various factors, including infections, autoimmune diseases, and certain genetic conditions. Sometimes, the exact cause is unknown. Risk factors include a family history of kidney disease, having certain infections like strep throat, or living with autoimmune conditions such as lupus or Goodpasture's syndrome.

The causes of glomerulonephritis are diverse and can be broadly categorized. In some cases, the condition is primary, meaning it affects only the kidneys. In other cases, it is secondary, meaning it is part of a larger disease that affects other parts of the body as well. **Common causes and risk factors include:** * **Infections:** Certain bacterial or viral infections can trigger glomerulonephritis. For example, post-streptococcal glomerulonephritis can develop one to two weeks after a strep throat infection or, less commonly, a skin infection like impetigo. Other infections like endocarditis, HIV, or hepatitis B and C can also be linked. * **Autoimmune diseases:** These are conditions where your body's immune system mistakenly attacks its own healthy tissues. Examples include lupus (systemic lupus erythematosus), which can affect many organs including the kidneys, and Goodpasture's syndrome, a rare disease that causes bleeding in the lungs and inflammation in the kidneys. * **Vasculitis:** This is a group of diseases that cause inflammation of blood vessels. Conditions like polyarteritis nodosa or granulomatosis with polyangiitis (Wegener's granulomatosis) can affect the small blood vessels in the kidneys. * **Genetic factors:** Some forms of glomerulonephritis, such as Alport syndrome, are inherited and run in families. These conditions can lead to progressive kidney damage over time. * **Other conditions:** Rarely, conditions like IgA nephropathy, which involves deposits of an antibody called immunoglobulin A in the glomeruli, can cause inflammation. Certain cancers or medications can also sometimes be associated with glomerulonephritis.

How it's diagnosed

Diagnosing glomerulonephritis typically begins with a physical exam and a review of your medical history and symptoms. Key diagnostic tests include urine tests to check for blood and protein, blood tests to assess kidney function, and imaging tests like ultrasound. A kidney biopsy, where a small tissue sample is taken, is often needed to confirm the diagnosis and determine the specific type and severity.

If your doctor suspects glomerulonephritis, they will perform several tests to confirm the diagnosis and understand the extent of kidney damage. **Common diagnostic tests include:** * **Urine tests (urinalysis):** A urine sample is checked for the presence of red blood cells, white blood cells, and protein. High levels of these substances can indicate kidney damage and inflammation in the glomeruli. * **Blood tests:** These tests measure levels of waste products like creatinine and urea nitrogen in your blood. Elevated levels suggest that your kidneys are not filtering waste effectively. Blood tests can also check for signs of infection, inflammation, or autoimmune markers. * **Imaging tests:** An ultrasound of your kidneys can show their size and shape and detect any blockages or abnormalities. Other imaging, such as a CT scan or MRI, may be used in specific situations to get a more detailed view. * **Kidney biopsy:** This is often the most definitive test. During a kidney biopsy, a small piece of kidney tissue is removed with a needle and examined under a microscope. This allows doctors to identify the specific type of glomerulonephritis, assess the degree of damage, and guide treatment decisions. It helps distinguish between different causes and forms of the disease.

Treatment options

Treatment for glomerulonephritis depends on its specific cause, type, and severity. The main goals are to reduce inflammation, control blood pressure, and slow the progression of kidney damage. Options may include medications like corticosteroids or immunosuppressants, blood pressure-lowering drugs, and dietary changes. In severe cases, dialysis or a kidney transplant might be necessary.

The treatment plan for glomerulonephritis is highly individualized. Your doctor will consider the underlying cause, how quickly the disease is progressing, and your overall health when recommending treatments. **Common treatment approaches include:** * **Medications to reduce inflammation:** Corticosteroids, such as prednisone, are often used to suppress the immune system and reduce inflammation in the glomeruli. For more severe cases or certain types of glomerulonephritis, other immunosuppressant drugs like cyclophosphamide or mycophenolate mofetil may be prescribed. * **Blood pressure control:** High blood pressure can worsen kidney damage, so medications to lower blood pressure are crucial. Angiotensin-converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs) are commonly used because they also help protect the kidneys. * **Dietary changes:** Limiting salt intake can help control swelling and blood pressure. Your doctor might also recommend reducing protein intake to lessen the workload on your kidneys, or restricting potassium and phosphorus if your kidney function is significantly impaired. * **Diuretics:** These medications help your body remove excess fluid and can reduce swelling and high blood pressure. * **Plasma exchange (plasmapheresis):** In some severe, rapidly progressing forms of glomerulonephritis, this procedure may be used. It involves removing the liquid part of your blood (plasma) and replacing it with fresh plasma or a plasma substitute, to remove harmful antibodies. * **Dialysis or kidney transplant:** If kidney function declines to the point of kidney failure, dialysis may be needed to filter your blood. In some cases, a kidney transplant may be an option to replace the damaged kidneys with a healthy donor kidney.

Recovery & outlook

The recovery and long-term outlook for glomerulonephritis vary greatly depending on the cause, type, and how early it's diagnosed and treated. Some forms may resolve completely, while others can lead to chronic kidney disease or even kidney failure over time. Regular monitoring and adherence to treatment are crucial for managing the condition and preserving kidney function.

The prognosis for glomerulonephritis is highly variable. Acute glomerulonephritis, especially in children after a strep infection, often resolves completely with appropriate treatment. However, some individuals, particularly adults, may develop chronic kidney disease. For chronic glomerulonephritis, the goal of treatment is to slow the progression of kidney damage and prevent complications. Many people can live full lives with careful management. However, the condition can sometimes worsen over time, leading to: * **Chronic kidney disease (CKD):** Persistent damage to the kidneys can lead to a gradual loss of kidney function. * **Kidney failure (end-stage renal disease):** If the kidneys lose most of their ability to function, dialysis or a kidney transplant becomes necessary for survival. * **High blood pressure:** This is a common complication that can further damage the kidneys and increase the risk of heart disease. * **Nephrotic syndrome:** This is a group of symptoms including high levels of protein in the urine, low protein in the blood, high cholesterol, and significant swelling. Regular follow-up appointments with your doctor, including blood and urine tests, are essential to monitor your kidney function and adjust your treatment plan as needed. Adhering to prescribed medications, dietary recommendations, and lifestyle changes can significantly impact your long-term health and slow the progression of the disease.

When to see a doctor

You should see a doctor promptly if you notice any symptoms of glomerulonephritis, such as pink or cola-colored urine, foamy urine, or unexplained swelling in your face, hands, or feet. Seek immediate medical attention if you experience sudden, severe swelling, significantly reduced urine output, or symptoms of kidney failure like severe fatigue, nausea, or shortness of breath.

Early detection and treatment of glomerulonephritis can help prevent serious complications and preserve kidney function. Do not delay seeking medical advice if you experience any of the following: * **Changes in urine:** If your urine appears pink, reddish, or cola-colored, or if it is consistently foamy, contact your doctor right away. These can be signs of blood or excessive protein in your urine. * **Unexplained swelling:** New or worsening swelling in your face, especially around your eyes, or in your hands, feet, or ankles, warrants a medical evaluation. * **High blood pressure symptoms:** If you have symptoms that might suggest high blood pressure, such as headaches, vision changes, or dizziness, consult your doctor. **Seek emergency medical care if you experience:** * **Sudden and severe swelling:** Especially if it's accompanied by difficulty breathing. * **Significant decrease in urine output:** If you are urinating much less than usual or not at all. * **Symptoms of acute kidney failure:** These can include severe fatigue, persistent nausea or vomiting, loss of appetite, confusion, or shortness of breath. These symptoms indicate a medical emergency and require immediate attention.

Frequently asked questions

Can glomerulonephritis be cured?

Whether glomerulonephritis can be cured depends on its specific cause and type. Acute forms, especially those triggered by infections like strep throat, can sometimes resolve completely with treatment. However, chronic forms often require ongoing management to control symptoms, slow disease progression, and prevent kidney failure, rather than a complete cure.

Is glomerulonephritis hereditary?

Some types of glomerulonephritis can be hereditary, meaning they are passed down through families. For example, Alport syndrome is a genetic condition that causes progressive kidney disease and can lead to glomerulonephritis. However, many forms of glomerulonephritis are not hereditary and are caused by infections or autoimmune diseases.

What is the difference between acute and chronic glomerulonephritis?

Acute glomerulonephritis develops suddenly, often after an infection, and symptoms appear quickly. It may resolve completely or progress. Chronic glomerulonephritis develops slowly over months or years, often with few early symptoms, and can lead to progressive kidney damage over time.

Can diet help manage glomerulonephritis?

Yes, dietary changes are often an important part of managing glomerulonephritis. Your doctor or a dietitian may recommend limiting salt intake to control swelling and blood pressure. Depending on your kidney function, you might also need to restrict protein, potassium, or phosphorus to reduce the workload on your kidneys and prevent complications.

What are the long-term complications of glomerulonephritis?

Long-term complications of glomerulonephritis can include chronic kidney disease, which is a gradual loss of kidney function, and eventually kidney failure (end-stage renal disease) requiring dialysis or a transplant. Other complications include high blood pressure, nephrotic syndrome (severe protein loss in urine), and increased risk of heart disease.

How often do I need to see a doctor if I have glomerulonephritis?

If you have glomerulonephritis, you will need regular follow-up appointments with your doctor, often a kidney specialist (nephrologist). The frequency of visits depends on the type and severity of your condition, your treatment plan, and how well your kidneys are functioning. Regular blood and urine tests are crucial to monitor your kidney health.

Sources

• MedlinePlus — Glomerulonephritis
• Mayo Clinic — Glomerulonephritis
• Cochrane Library — Glomerulonephritis