The main thing
- Inflammation of the kidney glomeruli is triggered by the immune system mistakenly attacking the filter's own tissues.
- The trigger is often a previous tonsillitis, scarlet fever or skin inflammation.
- It is noticed by facial swelling in the morning, reddish or brownish urine and a rise in blood pressure.
- The examination is started by a nephrologist with a general urine test, a blood test for creatinine and an ultrasound of the kidneys.
- Follow-up with a nephrologist and blood pressure control determine how long kidney function will be preserved.
What is glomerulonephritis
Glomerulonephritis is an inflammation of the glomeruli of the kidneys, which are responsible for filtering the blood and forming urine. The disease can run an acute course or develop gradually, sometimes leading to impaired kidney function.
What happens in the body
The glomeruli of the kidneys are a dense tangle of small vessels through which the blood is cleared of excess fluid and metabolic products. In glomerulonephritis, inflammation develops in this filter, and the walls of the capillaries stop properly retaining the proteins and blood cells the body needs. The inflammatory process is triggered by the immune system, which mistakenly attacks the body's own tissues of the renal glomerulus. Because of this, filtration slows down, and substances that should not be there begin to enter the urine. A person may notice changes in the amount and appearance of urine, swelling in the morning and general weakness without an obvious cause. Gradually the load on the kidneys grows, and without attention to one's condition the function of the organ may become persistently impaired. Therefore, if such changes appear, it is important not to postpone a visit to the doctor and to undergo an examination.
What causes it to develop
- A past infection: tonsillitis, scarlet fever or a skin inflammation often become the trigger after which the immune response affects the kidney tissue.
- Autoimmune diseases: in such conditions the body's defences are directed against its own cells, and the glomeruli become one of the targets.
- Hereditary predisposition: if close relatives have had kidney problems, the risk of encountering a similar condition is noticeably higher.
- Taking certain medicines: some medications can cause a reaction in which the kidney tissue suffers, so medical supervision is important.
- Exposure to toxins: contact with industrial poisons and other harmful substances creates an additional load on the filtering system of the kidneys.
- Unknown cause: sometimes the exact trigger cannot be identified, and then the process is called primary or idiopathic.
Who encounters this more often
Glomerulonephritis occurs in people of different ages, but it is noticeably more often detected in children and young adults after past infections. In a child or adolescent the trigger is often tonsillitis or a skin inflammation, while in adults the disease often runs a more subtle course and is detected by chance. Heredity plays a certain role: if relatives have had kidney diseases, attention to one's condition should be higher. People with autoimmune disorders are also in the group where such inflammation develops more often than in others. Lifestyle also matters: constant contact with toxins at work increases the load on the kidneys. It has been noted that in men this condition occurs somewhat more often than in women. Therefore, with a family history or a past infection, it is worth discussing with a doctor whether kidney function needs to be checked.
What symptoms can occur?
Glomerulonephritis can present in different ways: from barely noticeable changes in tests to pronounced oedema and a rise in blood pressure. Below is a breakdown of which signs occur, how they are noticed at the onset, and when help is needed urgently.
How it is noticed at the very beginning
Glomerulonephritis often begins with signs that are easy to put down to fatigue or a cold. A person feels general weakness and malaise but explains it by being overworked or not getting enough sleep. In the morning, swelling appears on the face, especially around the eyes, and by the evening the legs swell. Urine may become reddish or brown, and this is noticed by chance, without pain and without other complaints. The amount of urine sometimes decreases, although the person hardly keeps track of this. Blood pressure may rise, causing headache and heaviness in the back of the head. Sometimes the disease is discovered during an examination for another reason, when tests show changes. If such signs persist for several days, it is worth booking an appointment with a nephrologist rather than waiting for them to pass on their own.
Signs that occur most often
- Swelling on the face and legs: in the morning the eyelids and cheeks puff up, by the evening the feet and lower legs swell, and shoes become tight.
- Change in the colour of urine: it takes on a reddish or brown tint, which is noticeable when simply looking at the contents.
- Decrease in the amount of urine: the urge becomes less frequent, and the volume of fluid passed drops noticeably compared with usual.
- Rise in blood pressure: headache, heaviness in the back of the head and ringing in the ears appear, which were not there before.
- General weakness and malaise: the person tires quickly, finds it hard to do their usual work, and becomes sleepy during the day.
- Pain in the lower back: it is felt on one or both sides, may be dull and is not related to movement or lifting heavy objects.
When to seek help urgently
Examinations and tests
Examination for glomerulonephritis is based on a conversation with the doctor, a physical examination and subsequent laboratory and instrumental investigations. Each method helps to assess kidney function and understand the possible cause of the changes.
How the examination begins
The examination begins with an appointment, at which the doctor asks the patient in detail about how they feel and about past illnesses. Then they examine the skin, measure blood pressure and check whether there is any swelling on the face and legs. After the conversation and examination, the doctor orders laboratory and instrumental investigations to assess kidney function. This order is needed because the complaints and appearance suggest which tests will provide the most information. Taken together, the data allow the whole picture to be seen, rather than individual scattered indicators. If this stage is skipped and complex procedures are started straight away, some important details will remain unnoticed. Therefore, it is not worth postponing the visit and coming without information about how the way you feel has changed recently.
What is ordered and what it shows
What is worth preparing for the appointment
- Discharge summaries from the medical history: they show how the condition developed earlier and help the doctor see the overall picture without unnecessary questions.
- Results of previous urine and blood tests: they show whether the indicators have changed over time, which is important for assessing the dynamics.
- Ultrasound examination reports: if the examination has already been carried out, the images and descriptions give an idea of the structure of the kidneys at that time.
- A list of all medicines being taken: some of them affect the kidneys, so the doctor needs to know about them in advance in order to assess the data correctly.
- Records of blood pressure and swelling: your own observations of how you feel at home complement the examination and help to notice what does not manifest constantly.
Which doctor should I see?
If glomerulonephritis is suspected, a referral to a doctor is arranged by a general practitioner or paediatrician at the place of residence. After that, a relevant specialist manages the condition, and how early observation begins determines the course of the disease.
Which specialist manages this condition
Glomerulonephritis is managed by a nephrologist, because it is they who understand how the kidneys work and how inflammation affects filtration. If there is no nephrologist nearby, the initial appointment is carried out by a general practitioner or paediatrician, and then the patient is referred to a relevant specialist. The nephrologist clarifies the form and cause of the disease, assesses how much kidney function has been affected, and decides whether treatment can be done at home or whether observation in hospital is needed. They also monitor blood pressure, because its rise worsens the condition of the kidneys and heart. Some cases are linked to another disease, and then doctors of related specialties are involved in the observation. It is important for the patient to bring all previous records and test results so that the doctor can see the full picture. If the condition worsens between visits, one should not wait for a scheduled appointment — one should contact the doctor earlier.
What treatment consists of
- Selection of therapy: the nephrologist chooses the directions of care taking into account the form of the disease, its cause and the condition of the kidneys in the particular patient.
- Blood pressure control: blood pressure is kept within the target range, because its rise increases the load on the kidneys and accelerates their damage.
- Diet with restriction of salt and protein: such a diet reduces the load on the kidneys and helps keep blood pressure under control, so it is followed constantly, not from time to time.
- Observation by a nephrologist: regular visits allow deterioration to be noticed in time and care to be adjusted while the changes are still reversible.
- Treatment of the underlying disease: if the cause is linked to another illness, work is carried out in two directions at once, otherwise the kidneys will suffer again.
- Observation in hospital: in severe cases, care is provided in hospital, where the condition can be monitored around the clock and changes can be responded to quickly.
What depends on the patient themselves
The regularity of observation by a nephrologist largely determines how long kidney function will be preserved and how manageable the condition will be. The patient decides for themselves whether to come to scheduled visits, whether to have tests done on time and whether to tell the doctor about new complaints. Missed appointments lead to deterioration being noticed late, when less can already be changed. Home blood pressure monitoring helps to see a rise between visits and to tell the doctor about it in time. Following a diet with restriction of salt and protein rests not on prohibitions but on habit, and lapses bring the load back onto the kidneys. Records of how one feels, blood pressure and measures taken make the conversation with the doctor concrete and help to select care more precisely. Calm and consistent following of recommendations gives more than rare decisive attempts to fix everything at once.
What helps prevent an exacerbation?
An exacerbation of glomerulonephritis cannot always be prevented, but some of the risks depend on the person's own everyday decisions. Below are habits, values to monitor regularly, and why to see a doctor when feeling well.
What to change in habits
There is no specific prevention of glomerulonephritis, so the basis is taking care of the kidneys in everyday life. Timely treatment of infections — tonsillitis, scarlet fever, skin and urinary tract infections — reduces the burden on kidney tissue. Blood pressure control matters because persistently raised pressure gradually damages the kidney vessels. Avoiding toxic exposures means being careful with painkillers taken without a prescription and with contact with solvents, heavy metals and industrial chemicals. Dehydration and abrupt changes in diet, such as prolonged strict diets or excess salt, also affect kidney function. Smoking and alcohol abuse worsen the course of chronic diseases that affect the kidneys. With a hereditary predisposition to kidney disease, regular check-ups help to notice changes before complaints appear. It is sensible to discuss any new habits in diet and exercise with a doctor so that they do not conflict with the recommended monitoring.
What to keep under control
- Blood pressure: it is measured at home in a calm setting, because persistently raised pressure accelerates damage to the kidneys and heart.
- Urine test: it is used to monitor the appearance of protein and blood, which may indicate activity of the process.
- Kidney function: it is assessed by blood tests in order to notice a decline in filtration in time even when there are no complaints.
- Past infections: any tonsillitis, scarlet fever or purulent process should be reported to the doctor, as they may affect the kidneys.
- Taking painkillers: uncontrolled use of such medicines should be discussed with a doctor, since some of them are toxic to the kidneys.
- Monitoring diary: records of pressure, swelling and how you feel help the doctor to see the dynamics at an appointment and adjust the monitoring.
How often to see a doctor
Regular check-ups are needed even when feeling well, because glomerulonephritis can proceed for a long time without noticeable complaints. The doctor sets the frequency of visits individually, guided by the activity of the process, test results and concomitant diseases. If swelling of the face in the morning, a change in the colour of urine, weakness or a rise in pressure appear, the visit should not be postponed until the planned date. Between appointments it is useful to keep records of measurements and note what illnesses the person has had, so that the doctor sees the full picture. Missed check-ups mean that changes are noticed later, when it is more difficult to adjust the monitoring. With a hereditary predisposition to kidney disease, check-ups are carried out more often than when there is no such factor. Agree with the doctor on a clear schedule of visits and keep to it, even if nothing is troubling you.
What is worth remembering
Glomerulonephritis is a condition in which it is important not so much to memorise individual terms as to understand the general logic: the kidneys are affected gradually, and the signs may remain unnoticed for a long time. Below is what is worth keeping in mind after becoming familiar with the topic.
Key takeaways
Glomerulonephritis rarely manifests suddenly and violently; more often it develops insidiously, and the person's well-being may remain as usual. That is precisely why the appearance of oedema, a change in the colour of urine or unexplained weakness deserves attention rather than being explained away by fatigue. Glomerulonephritis is often detected during a routine urine test, when a person comes for a completely different reason. This means that a timely examination can identify the problem before it has time to affect kidney function. Glomerulonephritis requires follow-up with a specialist, rather than independent attempts to work out the causes and select treatment for oneself. The course of glomerulonephritis differs from person to person, so other people's stories and the advice of acquaintances are a poor guide here. The mainstay in dealing with it is regular monitoring and an open conversation with a doctor who sees the examination results. One should not put off a visit to a specialist if alarming signs appear: seeking help early provides more opportunities to influence the situation.
