14 Common Symptoms of Renal Failure

2. Shortness of Breath

You might notice that you get out of breath more easily when your kidneys stop working properly. This often happens because damaged kidneys cannot remove extra fluid from your body. When too much fluid builds up, it can collect in your lungs and make it harder for you to breathe comfortably.

You may feel like you cannot take a full breath even while resting. You might also find it difficult to lie flat without feeling breathless. Some people describe needing to sit up or sleep with extra pillows to breathe more easily.

Healthy kidneys help make a hormone that tells your body to produce red blood cells. When kidneys fail, your body makes fewer of them, leading to less oxygen reaching your tissues. This can cause tiredness and a feeling of breathlessness after mild activity. In more advanced stages of kidney failure, breathing can become more labored, especially during the night or after eating.

3. Swollen Ankles and Puffy Eyes

Swelling in your ankles or puffiness around your eyes can be one of the first signs of kidney problems. When your kidneys do not filter waste and extra fluid properly, that fluid can build up in your body. Because of gravity, this swelling often appears in your lower legs, ankles, and feet.

Puffiness around your eyes is also common and usually shows up in the morning before improving later in the day. This happens because damaged kidneys allow protein to leak into your urine instead of keeping it in your bloodstream. Losing this protein changes how your body holds fluid, making the swelling more noticeable.

You might notice that your shoes or socks feel tighter toward the end of the day, or that your rings leave marks on your fingers. Mild swelling can also occur for reasons unrelated to the kidneys, such as standing for long periods, eating salty foods, or taking certain medications like blood pressure drugs or steroids.

4. Problems with Urine

Changes in how you urinate are one of the most common signs that your kidneys may not be working well. You might notice you need to urinate more often, especially at night. Some people see the opposite, with less urine output than normal.

The color, amount, or texture of your urine can also change. Foamy or bubbly urine can appear when your body starts leaking protein into the urine. Sometimes, you may see dark or cloudy urine, or a reddish tint that can signal blood. These changes often mean waste is building up in your body because your kidneys are losing their ability to filter properly.

Discomfort during urination can also occur. You might feel pressure, a burning sensation, or difficulty starting or stopping the flow. Many other conditions, like urinary infections or dehydration, can also cause some of these symptoms, but consistent or severe changes often point to kidney problems that need medical attention.

5. Loss of Appetite

You may notice that your interest in food begins to fade as kidney function declines. This often happens because waste builds up in your blood when your kidneys cannot remove it effectively. These toxins can change how food tastes, sometimes creating a metallic or bitter flavor, or they may make you feel full even after eating very little.

As appetite decreases, you may experience unintentional weight loss, weakness, or fatigue. Nausea, changes in smell, or dry mouth may also make eating feel unpleasant and contribute to the loss of interest in food. These changes can lead you to skip meals or eat much less than usual without realizing it.

Keeping a simple daily log of what you eat may help you notice changes in your appetite or food intake. You may also find relief by choosing small, frequent meals or foods that are easier to digest. Drinking enough fluids can also help prevent dehydration that may make appetite loss feel worse.

6. Confusion and Muscle Cramps

You might notice periods where you feel confused or have trouble thinking clearly. This often occurs when waste and toxins build up in your blood because the kidneys are not filtering properly. As the body’s chemical balance shifts, brain function can be affected. This may lead to feelings of disorientation, forgetfulness, or difficulty focusing on simple tasks.

Muscle cramps are also common and may develop in your legs, arms, or hands. These cramps may feel sudden and painful, sometimes waking you up at night. They often occur when the body cannot maintain normal levels of minerals such as calcium, potassium, and sodium. When these levels become too high or too low, muscles may tighten or spasm.

You might also experience these symptoms more often when kidney function continues to decline. If these symptoms occur often or become severe, your healthcare provider can adjust your treatment plan or diet to help manage them.

7. Metabolic Acidosis

Metabolic acidosis happens when your body produces too much acid or when your kidneys cannot remove enough of it. In kidney failure, this imbalance often occurs because damaged kidneys struggle to maintain the right acid–base balance in your blood. As acid levels continue to rise, they can begin to affect how your organs function.

You may notice changes in breathing first. The body tries to remove excess acid by breathing faster and deeper, which helps reduce acid levels in the blood. Some people feel very tired, confused, or weak when this happens. You might also feel dizzy or have headaches as your body tries to adjust.

If acid levels become too high, more serious problems can develop, such as very low blood pressure or shock, which require immediate medical care. Chronic or mild cases can also weaken muscles and bones over time because acid buildup interferes with how the body uses nutrients.

8. Dry and Itchy Skin

You may notice your skin becoming dry, rough, or itchy when your kidneys start losing their ability to remove waste from your blood. As waste and toxins build up, your skin can lose moisture, which may lead to tightness or flaking. Itching can occur anywhere on your body but often gets worse at night or after bathing.

This symptom develops because your kidneys help regulate minerals like phosphorus and calcium. When these minerals become unbalanced, they can irritate your skin. Reduced oil and sweat production due to low kidney function can also make dryness worse. To help reduce discomfort, many people keep their skin clean and hydrated with gentle, fragrance-free moisturizers.

Avoiding long, hot showers can also help prevent dryness. Wearing loose-fitting clothing made from soft fabrics may lessen irritation. Some people may also need treatments that help manage mineral levels in the blood, such as medications that balance phosphorus or calcium.

9. Irregular Heartbeat

In people with kidney failure, waste buildup in the blood can affect how the heart’s electrical system works, leading to irregular rhythms. An irregular heartbeat, or arrhythmia, happens when the heart does not beat in a steady rhythm. You might notice your heart racing, skipping beats, or beating too slowly, which can make you feel uneasy or short of breath.

You may also feel dizzy, tired, or lightheaded when your heart rhythm changes. These symptoms can come and go, lasting only a few seconds or minutes. In severe cases, they may happen along with chest pain or fainting and need emergency care.

Irregular heartbeats in kidney failure often result from imbalances of potassium, magnesium, or other minerals. These can build up when your kidneys no longer filter properly. Heart disease, high blood pressure, or anemia may also contribute to the problem. Regular monitoring of your heart and blood chemistry plays an important role in reducing risks and keeping your rhythm steady.

10. Chest Pain

You may feel chest pain when your kidneys are not working well. This discomfort can feel like pressure, tightness, or an ache in your chest, and it may spread to the shoulders, arms, or back. The pain can occur when your heart has to work harder due to fluid buildup caused by kidney problems.

Chest pain in renal failure often links to how your body handles fluid and waste. When the kidneys fail, extra fluid can collect around the heart or lungs, making it harder for them to function normally. This may lead to shortness of breath, swelling, and chest discomfort.

Your heartbeat might also feel irregular or faster than usual when the heart is under added strain. While some causes relate to kidney issues, others may signal more serious heart problems. Staying aware of these changes is important. If you experience ongoing or severe chest pain, it should be considered an emergency and seeking immediate medical attention is a priority.

11. Nausea

You may notice nausea as one of the early warning signs of kidney problems. When your kidneys start losing their ability to filter waste, harmful substances build up in your blood. This buildup upsets your stomach and can make eating difficult.

Nausea in renal failure often appears alongside a poor appetite and changes in taste. Some people describe food as having a metallic taste or being unpleasant. You might also feel full after eating very little or find it harder to keep food down, especially later in the day. These changes can make meals harder to tolerate, and certain treatments or medications used to manage kidney disease may worsen nausea.

Staying hydrated and choosing foods that are easier on the stomach may help ease some of the discomfort. If nausea continues for several days or begins to affect how much you eat, seeking medical attention can help ensure the symptom is properly addressed.

12. Glomerulonephritis

Glomerulonephritis happens when the tiny filters in your kidneys, called glomeruli, become swollen or damaged. These filters normally clean your blood and remove extra fluid, but inflammation makes it harder for your kidneys to get rid of waste. You might notice changes in your urine, such as dark, rust-colored, or foamy urine.

Swelling can show up around your eyes, feet, or legs. Some people feel very tired or have less appetite. Others may experience shortness of breath, joint pain, or nausea. Treatment depends on what caused the inflammation. Your doctor may prescribe drugs that lower blood pressure, reduce inflammation, or calm your immune system.

In some cases, a special blood-cleaning process called plasmapheresis helps remove harmful antibodies. Glomerulonephritis may improve with proper management, but it can also lead to chronic kidney disease if not addressed early. Limiting salt, protein, or fluid intake may help ease the strain on your kidneys.

13. A Decrease in Urine Production

A noticeable drop in how much urine you pass can be one of the earliest signs of renal failure. Your kidneys’ main job is to filter waste and extra fluid from your blood. When they stop working properly, less urine is made, and your body may start holding onto fluids.

You might see your urine become darker, foamy, or more concentrated. In some cases, you could produce very little or no urine at all. This happens because the kidneys can no longer remove enough waste and excess water. As fluid builds up, swelling may appear in your legs, ankles, or face.

A decrease in urine output can sometimes result from dehydration or infection, but changes that last longer may suggest a more serious kidney problem. Keep an eye on how often you go to the bathroom and how much you’re peeing. If you notice you’re going a lot less than normal or if your pee looks really dark, it’s a good idea to reach out to a doctor.

14. Seizure

When kidney function becomes very poor, waste and fluid can build up in your body and affect your brain. This can change how your brain’s electrical signals work, which sometimes leads to a seizure. A seizure is a sudden burst of abnormal electrical activity that causes temporary changes in movement, behavior, or awareness.

You might notice symptoms such as jerking or twitching in one part of your body, stiff muscles, or a brief loss of consciousness episode. Some people remain awake but feel confused or unable to control movements. These episodes may last seconds or minutes, depending on how badly your body chemistry is imbalanced.

High levels of toxins, very low sodium, or sudden shifts in fluid balance are common causes. Certain medications, especially when not adjusted for reduced kidney function, can also raise the risk. Most seizures linked to kidney failure improve once waste and fluid levels are controlled through dialysis or other care.