Nephrology · Membranoproliferative Glomerulonephritis

Symptoms and Warning Signs of MPGN

At a Glance

The most common warning signs of MPGN include foamy or frothy urine due to protein leaks, and dark or tea-colored urine caused by blood. Other key symptoms include swelling in the legs or around the eyes, high blood pressure, and persistent fatigue as kidney function declines.

The symptoms of MPGN (Membranoproliferative Glomerulonephritis) and C3G (C3 Glomerulopathy) are often the first signs that the kidneys are struggling to filter the blood correctly. Because these conditions are a “pattern of injury,” the symptoms can vary significantly from person to person. Some patients may have no symptoms at all, discovering the condition only through routine blood or urine tests, while others may experience sudden and severe changes ^[1]^[2].

Changes in Your Urine

The most common signs of kidney injury in MPGN and C3G are found in the urine. While these signs don’t tell the whole story, they are important clues ^[3]^[4]:

Foamy or Frothy Urine: This is often a sign of proteinuria (excess protein in the urine). When the kidney’s filters are damaged, protein that should stay in your blood leaks into the urine, creating a soapy or bubbly appearance ^[3]^[5].
Dark or “Tea-Colored” Urine: This is a sign of hematuria (blood in the urine). In glomerular diseases like MPGN, blood often changes color as it passes through the urinary tract, making the urine look dark, reddish-brown, or like cola ^[3]^[5].

Understanding the Syndromes

Doctors often group these symptoms into two main categories, which describe how the kidney is being affected:

Nephrotic Syndrome

This occurs when the kidney leaks massive amounts of protein. It is a common presentation in both IC-MPGN and C3G ^[6]^[1]. Symptoms include:

Edema (Swelling): Significant fluid buildup, usually starting in the ankles and legs or around the eyes ^[7]^[2].
Weight Gain: Rapid weight gain caused by the body retaining fluid ^[4].
High Cholesterol: The liver often produces more fats in response to the loss of protein in the blood ^[2].

Nephritic Syndrome

This is characterized by inflammation in the filters. While it also involves protein loss, the hallmarks are ^[1]:

Hypertension (High Blood Pressure): A very common and critical symptom to manage, as high pressure further damages the kidneys ^[1]^[2].
Visible Blood in Urine: As mentioned above, the “cola-colored” urine ^[3].
Decreased Urine Output: Finding that you are urinating less frequently than usual.

Signs of Declining Kidney Function

As MPGN progresses, you may notice systemic symptoms that suggest your kidneys are not clearing waste products as they should. A declining eGFR (estimated Glomerular Filtration Rate) is the primary lab measurement of this decline ^[8]^[9]. Physical warning signs include:

Persistent Fatigue: This is one of the most frequently reported symptoms. It is a deep, systemic exhaustion that doesn’t always improve with rest ^[7]^[6].
Uremic Symptoms: As waste products (urea) build up in the blood, you may experience nausea, a metallic taste in the mouth, or itchy skin ^[10]^[11].
Worsening Blood Pressure: If blood pressure becomes increasingly difficult to control with medication, it can be a sign of worsening kidney strain ^[1].

Monitoring these symptoms alongside your lab work—specifically your proteinuria levels and eGFR—is the best way to track your condition and evaluate how well your treatment is working ^[12]^[13]^[14].

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Common questions in this guide

Why is my urine foamy or frothy?

Foamy or frothy urine is a common sign of proteinuria, which means there is excess protein in your urine. This happens when the kidney's filters are damaged and protein leaks from your blood into the urine instead of staying in your body.

What does dark or tea-colored urine mean for MPGN?

Dark, tea-colored, or cola-colored urine usually indicates hematuria, or blood in the urine. This color change occurs as blood passes through the urinary tract due to active inflammation in the kidney's filters.

What is the difference between nephrotic and nephritic syndrome?

Nephrotic syndrome involves massive protein loss leading to severe swelling, weight gain, and high cholesterol. Nephritic syndrome is driven by inflammation and typically causes high blood pressure and visible blood in the urine.

How can I tell if my kidney function is declining?

Physical warning signs of declining kidney function include severe, persistent fatigue that does not improve with rest. You may also experience symptoms like nausea, itchy skin, or a metallic taste in your mouth as waste products build up in your blood.

What tests are used to track my MPGN?

Your doctor will closely monitor your estimated Glomerular Filtration Rate (eGFR) and your proteinuria levels. Tracking these lab results alongside physical symptoms, like blood pressure changes and swelling, helps evaluate your kidney health and treatment progress.

Curated prompts to bring to your next appointment.

1.What was my exact proteinuria level (UPCR) at diagnosis, and what is our target goal?
2.Is my current blood pressure within the range that protects my kidneys?
3.What is my current eGFR, and is it stable compared to my last check?
4.Are my symptoms more typical of nephrotic syndrome or nephritic syndrome?
5.If my fatigue or swelling worsens between appointments, what specific changes should trigger an urgent call to your office?

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References (14)

1
Efficacy of iptacopan in idiopathic immune complex-mediated membranoproliferative glomerulonephritis refractory to conventional treatment.
López Hidalgo R, Caba Molina M, Ruiz Escolano FJ, et al.
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PMID: 41688332
2
Initial treatment patterns of primary membranoproliferative glomerulonephritis in Japan (2017-2021): an updated analysis based on nationwide personal clinical records.
Nakagawa N, Hiromura K, Isaka Y
Clinical and experimental nephrology 2026; (30(4)):590-596 doi:10.1007/s10157-026-02828-7.
PMID: 41692880
3
Atypical anti-glomerular basement membrane disease with membranous hyperplasia: diagnostic challenges and treatment variability.
Tong R, Luo Z, Zhong X, et al.
BMC nephrology 2024; (25(1)):132 doi:10.1186/s12882-024-03571-5.
PMID: 38622525
4
Rare case of post-varicella membranoproliferative glomerulonephritis presenting with massive proteinuria.
Majumdar A, Atam V, Mishra M
BMJ case reports 2020; (13(3)) doi:10.1136/bcr-2019-233084.
PMID: 32169983
5
An atypical anti-GBM disease complicated by idiopathic nodular glomerulosclerosis: Case report.
Qin J, Zhu T, Zhang H, Ou S
Clinical nephrology 2023; (99(2)):98-104 doi:10.5414/CN110962.
PMID: 36519941
6
Real-World Patient Characteristics, Burden, and Quality of Life in C3 Glomerulopathy and Primary Immune Complex Membranoproliferative GN.
Caravaca-Fontan F, Norouzi S, Huang M, et al.
Kidney360 2026; (7(3)):547-559 doi:10.34067/KID.0000001059.
PMID: 41359393
7
Iptacopan in Idiopathic Immune Complex-Mediated Membranoproliferative Glomerulonephritis: Protocol of the APPARENT Multicenter, Randomized Phase 3 Study.
Vivarelli M, Bomback AS, Meier M, et al.
Kidney international reports 2024; (9(1)):64-72 doi:10.1016/j.ekir.2023.10.022.
PMID: 38312795
8
Clinical features and pathogenesis of membranoproliferative glomerulonephritis: a nationwide analysis of the Japan renal biopsy registry from 2007 to 2015.
Nakagawa N, Hasebe N, Hattori M, et al.
Clinical and experimental nephrology 2018; (22(4)):797-807 doi:10.1007/s10157-017-1513-7.
PMID: 29214407
9
Demographic, clinical characteristics and treatment outcomes of immune-complex membranoproliferative glomerulonephritis and C3 glomerulonephritis in Japan: A retrospective analysis of data from the Japan Renal Biopsy Registry.
Nakagawa N, Mizuno M, Kato S, et al.
PloS one 2021; (16(9)):e0257397 doi:10.1371/journal.pone.0257397.
PMID: 34520493
10
Current and Emerging Therapies for C3 Glomerulopathy and Primary (Idiopathic) Immune Complex Membranoproliferative Glomerulonephritis.
Kavanagh D, Ariceta G, Vivarelli M, et al.
Kidney international reports 2026; (11(1)):17-31 doi:10.1016/j.ekir.2025.10.020.
PMID: 41541782
11
AJKD Atlas of Renal Pathology: Membranoproliferative Glomerulonephritis.
Fogo AB, Lusco MA, Najafian B, Alpers CE
American journal of kidney diseases : the official journal of the National Kidney Foundation 2015; (66(3)):e19-20.
PMID: 26300204
12
Natural History and Clinical Associations with Long-Term Outcomes in Primary C3 Glomerulopathy and Immune Complex-Mediated Membranoproliferative GN.
Nanchen G, Marasà M, Breno M, et al.
Clinical journal of the American Society of Nephrology : CJASN 2026; (21(4)):626-640 doi:10.2215/CJN.0000000953.
PMID: 41433110
13
Comparative Analysis of Proteinuria and Longitudinal Outcomes in Immune Complex Membranoproliferative Glomerulonephritis and C3 Glomerulopathy.
Caravaca-Fontán F, Toledo-Rojas R, Huerta A, et al.
Kidney international reports 2025; (10(4)):1223-1236 doi:10.1016/j.ekir.2025.01.024.
PMID: 40303231
14
Delphi Consensus on Surrogate End Points in C3 Glomerulopathy and Primary Immune Complex-Mediated Membranoproliferative Glomerulonephritis.
Caravaca-Fontán F, Fakhouri F, Licht C, et al.
Kidney international reports 2026; (11(2)):103671 doi:10.1016/j.ekir.2025.10.028.
PMID: 41502799

This page provides information on MPGN and C3G symptoms for educational purposes only. It does not replace professional medical advice. Always contact your nephrologist if you experience new or worsening symptoms, such as increased swelling or changes in your urine.

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