What Are the Symptoms of Kidney Disease?
If your kidneys are working well, you probably rarely think about them. But if they begin to struggle, the signs are often subtle and easy to dismiss.
Your kidneys play a vital role in keeping you healthy. They filter waste and excess fluid from your blood, which is then excreted as urine. They also help regulate blood pressure, balance important minerals like sodium and potassium, produce hormones that support red blood cell production and help keep your bones strong.
When your kidneys can’t effectively perform these functions, waste and fluid can build up in the body, potentially leading to complications over time.
Chronic kidney disease is often called a “silent disease” because the earliest symptoms can be so mild that you might not notice them. Changes in urination, unexpected fatigue or swelling might seem like something else entirely — a busy week, stress or just the byproduct of getting older.
That’s why it’s important to pay attention to changes in your body. Even small shifts can be worth checking on with your primary care provider.
How Your Kidneys Work
Your kidneys are your body’s natural waste removal system. They filter out waste products like urea, toxins and acids through tiny structures called nephrons, all while balancing fluids and producing urine that your bladder stores until it’s released.
Kidneys also help maintain the proper pH of your blood, regulate electrolyte balance and release important hormones, including erythropoietin for red blood cell production, renin for blood pressure regulation and calcitriol — the active form of vitamin D — which helps control calcium levels.
Why The Early Stages of Kidney Disease Are So Subtle
Early kidney disease can be hard to spot because your kidneys have a large number of nephrons, the tiny filtering units that do the work of keeping your blood clean. Even if some nephrons start to fail, the others can pick up the slack, so your kidneys continue working without obvious symptoms of failure.
However, this extra workload takes a toll over time. By the time symptoms like fatigue, swelling or changes in urination appear, kidney function may already have declined. That’s why regular screenings are so important, especially if you have risk factors like a family history of kidney disease or conditions such as high blood pressure or diabetes.
Types of Kidney Disease
You can experience numerous types of kidney problems.
Some of the most frequent illnesses include:
- Acute kidney injury (AKI): This is the sudden failure of the kidneys to filter waste
- Chronic kidney disease (CKD): CKD occurs when kidney failure occurs over a period of at least three months
- Glomerular disease: Conditions like glomerulonephritis and IgA nephropathy impact the kidney’s tiny filters, leading to an increase in the amount of protein in your urine, among other symptoms
- Kidney infections: Bacteria can cause urinary tract infections that impact the kidneys
- Obstructive kidney disease: This occurs when there’s a blockage in the urinary tract, which prevents urine from flowing out and leads to damaged kidneys
- Polycystic kidney disease (PKD): PKD occurs when clusters of cysts grow in the kidneys
- Rare or inherited disorders: Conditions like Alport syndrome, Fabry disease and medullary cystic kidney disease are rare diseases that cause everything from an increase of collagen that damages kidneys to genetic disorders in which the body can’t break down fats
The most common of these kidney issues is CKD. If you have noticed any symptoms of kidney disease, and especially chronic kidney disease, you should seek medical care. Find primary care near you by turning to our team at AdventHealth Primary Care+.
How CKD Affects the Body
CKD makes it difficult for your kidneys to filter waste products, leading to the buildup of toxins and fluid. Fluid retention causes swelling and high blood pressure, putting pressure on your heart and increasing your risk of heart attack or stroke.
Because the kidneys assist the production of red blood cells, you can develop anemia if the organs don’t function as they need to. You can also experience imbalances of minerals. These imbalances can impact your calcium, phosphorus and vitamin D levels, affecting bone health and increasing the risk of fractures.
Your urinary system will be impacted, too. You may notice that you need to urinate more frequently, especially at night. Bloody or foamy urine is a warning sign that something is off.
Common Symptoms of CKD
Kidney disease symptoms fall into two categories: more noticeable symptoms — signaling the condition has already advanced — and subtle signs that point to the start of the problem.
More Noticeable Symptoms
The following symptoms of kidney disease usually become noticeable when kidney function is already moderately or severely impaired.
- Changes in urination: You may urinate more often at night or find that you urinate less, which are both the result of the kidneys being unable to filter waste and balance fluids properly
- Changes in urine: Urine can look foamy or bloody because of red blood cells leaking past damaged filters or an increase in protein
- Edema: Swelling in your feet, ankles, legs or around the eyes occurs because the kidneys are not able to remove excess fluid
- High blood pressure: If your blood pressure is consistently high and you struggle to manage it, it can point to a damaged kidney that can’t regulate fluid levels
- Muscle cramps, body aches and restless legs: This can happen often at night because of electrolyte imbalances and waste buildup
- Nausea and loss of appetite: Toxins will build up, leading you to experience gastrointestinal issues, including vomiting
- Shortness of breath: Chest discomfort and difficulty breathing can occur from fluid retention around your lungs and heart
- Skin changes: Dry or itchy skin can also occur because of mineral imbalances and waste buildup
- Sleep problems: Trouble sleeping can occur due to cramps and other discomfort because of mineral and electrolyte imbalances
- Weakness, tiredness and trouble concentrating: Your red blood cell production decreases, leading to anemia, while the inability to eliminate toxins effectively makes you feel weak and in a fog
If you notice any of these symptoms, it may be time to consult with your primary care provider.
Symptom | Why It’s Happening |
|---|
| Feeling unusually tired, weak or having trouble concentrating | Waste builds up and kidney-related anemia can occur. |
| Changes in urination — more frequent, especially at night; or less urine than usual | Kidneys are struggling to balance fluids and filter waste properly. |
| Foamy, frothy or bubbly-looking urine — or seeing blood / darker urine | May be a sign of protein or red blood cells leaking through damaged filters. |
| Swelling (edema) — often in feet, ankles, legs or around eyes | Fluid retention due to kidneys not removing extra fluid. |
| Persistent high blood pressure (or difficulty controlling it) | Kidneys play a key role in regulating blood pressure; damage can affect this. |
| Nausea, loss of appetite, maybe vomiting | As toxins build up, you may feel “off,” lose appetite, or feel queasy. |
| Muscle cramps, restless legs or other “body aches” (especially at night) | Electrolyte imbalance and waste buildup can contribute. |
| Dry or itchy skin, or other skin changes | Waste buildup and imbalanced minerals can affect skin. |
| Shortness of breath, difficulty breathing or chest discomfort | Fluid buildup (in lungs or around heart) can make breathing difficult. |
| Trouble sleeping or constant “brain fog” / reduced mental sharpness | Waste buildup and poor sleep due to cramps or discomfort. |
Subtle or Early Warning Signs
Recognizing early signs is essential to preventing the progression of kidney disease. It’s especially important for people with risk factors, such as a family history of CKD, to know what signs to watch for.
- Mild eye puffiness: This could be the first sign that you may have fluid buildup because your kidney health is not at its best
- Mild foamy urine: Even if you feel fine, if your urine is persistently frothy or foamy, it could point to an increased amount of protein leaking through the kidneys’ filters
- Persistent fatigue: If you are consistently fatigued and there’s no obvious reason for it, you could have anemia
- Slight changes to urinary patterns: You may notice that you have to urinate more frequently or that you’re urinating less than normal
One of the most important things to keep in mind with these early warning signs is that they are non-specific. Many other health issues and even fluctuations in hormones, changes in diet and stress can cause them. Because of their non-specificity, if you have any concerns, you should speak with a doctor.
Why Symptoms Often Don’t Show Until Later — and What That Means for You
The kidneys have a “reserve capacity.” This means that even if they suffer some damage, they can still perform their function. They can compensate for a while, but not forever. Once enough filtering units are damaged, symptoms begin.
You may feel fine or have mild issues, like fatigue, that you chalk up to your daily life without realizing that you have early-stage kidney disease.
That’s why it’s so important to know if you have risk factors that make you more likely to develop any type of kidney damage. If you have health conditions like diabetes or high blood pressure, or a family history of these diseases, it’s time to reach out to a health care provider for kidney function and urine tests.
At AdventHealth Primary Care+, our chronic disease management services can help. Contact us to schedule an appointment.
Who Is Considered “At Risk”?
Anyone can develop kidney disease, but some are more likely to do so than others, including:
- Adults over the age of 60
- Individuals living with obesity
- Individuals who experience frequent urinary tract infections or urinary blockages
- Individuals with a history of kidney infections, kidney stones or acute kidney injuries
- People with autoimmune diseases
- People with heart disease, diabetes or high blood pressure
- Smokers
- Those who frequently use NSAIDs
If one or more of these risk factors apply, it’s never too early to speak with your health care team about screening tests.
When to Talk to Your Primary Care Provider
You don’t have to wait to spot warning signs before speaking with your PCP. If you’re worried about your risk of developing chronic kidney disease, you can get started scheduling the right screening tests to get answers.
The warning signs to look for include:
- Changes in urinary frequency
- Difficulty controlling high blood pressure
- Fatigue that doesn’t go away
- Foamy or discolored urine
- Persistent itchy skin
- Unexplained cramps or discomfort
- Unexplained swelling
- Unexplained weight loss
Catching kidney disease as early as possible and pursuing chronic kidney disease (CKD) treatment options gives you the chance to prevent it from progressing.
What to Expect if You See a Doctor
When you visit your PCP, they can perform a few tests to assess your kidney health. Urine tests look to see if there’s protein or blood in your urine, while blood tests will check whether there’s any waste accumulation and the level of your kidney function.
In some instances, your doctor may refer you to a specialist. When it comes to a PCP versus a specialist, keep in mind that the latter can perform more detailed assessments.
Testing doesn’t mean you have kidney disease. Health screenings are a vital part of preventive primary care services. And even if you do have symptoms of chronic kidney disease, early detection and taking steps to make changes can slow the disease’s progression significantly.
Being Proactive About Kidney Health
Being proactive about your kidney health can make a big difference. Start by managing existing health conditions, such as keeping your blood pressure under control or stabilizing your diabetes.
Simple lifestyle habits can also go a long way. Eating nutritious meals, staying well-hydrated and being mindful about how often you take painkillers can all help protect your kidneys over time.
Pay attention to your body, too. Keeping a small journal of any changes, even minor ones, can help you notice patterns early. And don’t hesitate to share these observations with your doctor. If kidney disease runs in your family or you have other risk factors, consider making an appointment with your primary care provider to discuss screenings and next steps.
