16 Symptoms of Kidney Disease

2. Fatigue

Fatigue is one of the most common signs of kidney disease. You may feel tired even after resting or sleeping well. This kind of tiredness usually lasts for a long time and does not go away with extra sleep.

When your kidneys do not work properly, waste products build up in your blood. This can make you feel weak and less alert. Your body may also produce fewer red blood cells, which can lead to anemia. Anemia reduces the amount of oxygen that reaches your muscles and brain, making you feel even more exhausted.

Some people also notice they have less energy to do daily tasks. Simple activities such as walking, cooking, or climbing stairs can start to feel more difficult. You may also have trouble concentrating or experience light-headedness.

3. Anemia

Anemia happens when your body does not have enough red blood cells or when those cells do not carry oxygen well. Red blood cells need iron and a hormone called erythropoietin, which your kidneys help produce. When kidney function drops, your body may not make enough of this hormone, leading to fewer red blood cells.

You may feel tired, weak, or short of breath. Some people notice pale skin, dizziness, or cold hands and feet. These signs may appear slowly, so you might not realize they are caused by changes in your kidneys. If you have kidney disease, mild anemia can develop early, while more severe forms often occur later.

Doctors may treat anemia by recommending iron supplements, changes in diet, or by prescribing drugs that help your body make red blood cells. If your kidneys cannot produce enough erythropoietin, synthetic hormone shots or other treatments from related medication classes can help.

4. Coldness

You may start to feel colder than usual when your kidneys are not working well. This feeling can come from anemia, which happens when the kidneys fail to make enough of a hormone that helps your body produce red blood cells. With fewer red blood cells, your body struggles to carry oxygen, making you feel chilled even in warm rooms.

Coldness can also happen because kidney disease affects how your body controls temperature. The buildup of waste in the blood may slow down metabolism and circulation, which can make your hands and feet feel cold or numb. You might notice you need more layers of clothing than others around you.

Some people feel constant fatigue or weakness along with coldness. This combination often shows that the body is not moving oxygen and nutrients effectively. Tracking when the sensation of coldness is most pronounced, such as in the morning or evening, can provide useful information.

5. Shortness of Breath

You may notice shortness of breath if your kidneys are not working well. When kidneys fail to remove extra fluid, that fluid can build up in your lungs and make it harder to breathe. You might feel winded after simple activities such as walking or climbing stairs.

Anemia, a common problem when kidneys are not making enough red blood cells, can also cause you to feel breathless. Without enough red blood cells, your body does not get the oxygen it needs, leading to fatigue and loss of stamina. This can happen even if you are at rest.

Shortness of breath from kidney disease can feel different from having a cold or asthma. The sensation may come with swelling in your feet, ankles, or face. Some people also experience chest discomfort if fluid collects around the heart and lungs.

Monitoring how often and when shortness of breath occurs can provide important information. If the symptom happens often or gets worse, it may signal fluid overload or worsening kidney function.

6. Brain Fog

You may notice that your thinking feels slower or less sharp than usual. This can happen when waste buildup in your blood affects how your brain works. Your kidneys remove toxins from your bloodstream, so when they lose function, harmful substances can collect and make it harder to focus or remember things.

Some people describe this as feeling cloudy or forgetful during conversations or daily tasks. You might take longer to complete work or find it difficult to stay alert. This can be frustrating and may affect your mood or motivation.

Brain fog linked to kidney disease can also come from other factors such as fatigue, lack of sleep, or changes in hormone levels. Low red blood cell counts can reduce oxygen to your brain, slowing down your thinking. In some cases, fluid imbalance or certain blood chemicals may also influence how clearly you can think.

7. Itchiness

Itchiness is a common symptom when your kidneys are not working properly. When kidney function decreases, wastes and minerals can build up in your blood. These substances may irritate your skin and cause a strong urge to scratch, often without a visible rash.

You may feel itchy in different parts of your body, but it often affects your back, arms, chest, or head. The feeling can happen at any time, though it tends to get worse at night. Some people describe it as a crawling or tingling feeling that does not go away even after scratching.

Itchiness linked to kidney disease is called kidney-related pruritus. It happens more often in people with advanced disease, especially those receiving dialysis. Dry skin, changes in nerve sensitivity, and chemical imbalances can make it worse. To help reduce itching, keeping your skin clean and moisturized may help. Avoiding hot showers, harsh soaps, and excessive scratching can prevent skin damage or infection.

8. Swelling

Swelling can happen when your kidneys lose the ability to remove extra fluid and salt from your body. This buildup often causes puffiness in the feet, ankles, hands, or face. You may notice that your shoes feel tighter or that rings no longer fit comfortably.

The swelling tends to increase after standing for long periods or later in the day. In the morning, some people see puffiness around their eyes. These changes can come on slowly and may be one of the first visible signs that your kidneys are not working as well as they should.

When your kidneys are damaged, proteins that usually stay in the blood can leak into your urine. Losing these proteins makes it easier for fluid to collect in the body’s tissues. The swelling may feel soft when pressed and can leave a dent that takes a few seconds to disappear.

Simple actions can help you notice changes early. Regularly monitoring your weight is useful, as sudden increases may indicate fluid retention. Also, paying attention to tight clothing or marks left by socks or shoes can provide important clues.

9. Puffiness in the Face

You might notice puffiness around your eyes or face, especially in the morning. This swelling happens when your kidneys are not removing extra fluid from your body as well as they should. The fluid can build up under your skin, causing a bloated or puffy look.

This sign often appears before other symptoms of kidney disease. Because many people do not realize they have kidney problems early on, facial puffiness can be one of the first signals to pay attention to. It may come and go at first, but over time it can become more noticeable.

Most swelling occurs in soft areas like the eyelids, cheeks, and under the chin. It can also feel heavier or tender. The puffiness may be mild or more obvious depending on how much fluid is being retained in the tissues.

Other causes such as allergies, lack of sleep, or high salt intake can also cause similar puffiness. However, when the cause is kidney related, the swelling often happens along with other changes like tiredness, frequent urination, or swollen feet and hands.

10. Taste Changes

When you have kidney disease, waste products can build up in your blood. This buildup can change the way foods and drinks taste. You might notice a metallic taste in your mouth or find that foods you once liked now taste different. These changes can make eating less enjoyable and may lower your appetite.

You might also find yourself disliking certain foods, especially meat or other protein-rich items. Some people say that everything tastes bland or bitter. Drinking enough water and keeping a clean mouth may help slightly, but the taste changes often continue as kidney function decreases.

Taste changes can lead to smaller meals and sometimes weight loss. Paying attention to your food intake is important so that you still get the nutrients your body needs. It is helpful to share any taste changes with a healthcare provider, who can review medications or suggest dietary adjustments.

11. Bad Breath

Bad breath can be an early or unnoticed sign of kidney disease. When your kidneys lose some of their ability to filter waste from your blood, certain toxins start to build up and give your breath a strange or unpleasant odor. These wastes affect the natural balance in your mouth.

People with reduced kidney function sometimes describe their breath as having a metallic or ammonia-like smell. Waste products, such as urea, break down into compounds that produce a distinct scent. The same chemical changes may also leave a bad taste in your mouth, even if you’ve just brushed your teeth.

You may also notice a dry mouth or changes in taste at the same time. These effects occur because saliva production and body chemistry shift when kidney function declines. Persistent bad breath combined with fatigue, changes in urination, or swelling may indicate kidney issues and should be discussed with a healthcare provider.

12. Nausea

You may feel sick to your stomach when your kidneys are not removing waste properly. As waste builds up in your blood, your body reacts by making you feel queasy or causing you to vomit. Extra toxins irritate your stomach and digestive system.

Nausea from kidney disease may come and go at first. Some people notice it after eating certain foods or early in the morning. As kidney function gets worse, nausea might become more frequent and harder to manage. You might also lose your appetite or start eating less, which can lead to unintended weight loss.

It is helpful to be aware of other symptoms that may occur alongside nausea, such as fatigue, a metallic taste in the mouth, or changes in urine color. While nausea alone does not always mean you have kidney disease, it can be an early clue when combined with other problems like swelling or shortness of breath. A healthcare provider can use blood and urine tests to find out what is causing your symptoms.

13. Changes in Urination Frequency

You may notice that you urinate more or less often than usual when your kidneys are not working properly. Healthy kidneys filter waste and extra fluid from your blood to make urine, but when your kidneys are damaged, this process changes.

Urinating more often, especially at night, can be an early sign of kidney problems because your kidneys are less able to concentrate urine. You might also feel a stronger urge to urinate or experience difficulty holding it in.

In some cases, you may urinate less than normal, which means your kidneys are not removing enough waste or fluid. Reduced output may also cause swelling in your hands, feet, or ankles because of fluid buildup.

Changes in the color or appearance of urine often occur with these frequency changes. Monitoring these changes, especially if they persist for several days, can provide valuable information. Tracking how often you urinate and noting any unusual signs can help your doctor understand what is happening with your kidneys.

14. Changes in Urine Color

Changes in urine color can be one of the earliest signs of kidney problems. You might notice your urine looking darker, lighter, or even reddish, which often reflects how well your kidneys are filtering waste and balancing fluids.

Pale or very clear urine can mean you are drinking a lot of water, but if it stays that way, it could also suggest your kidneys are not concentrating urine properly. Dark yellow or amber color usually means you are dehydrated. When kidneys do not remove enough waste, urine becomes more concentrated and appears darker.

If your urine looks orange, brown, pink, or red, it may contain blood or waste byproducts that should not be present. This change can signal issues such as infection, stones, or ongoing kidney damage.

The color changes can vary through the day, especially if you have not had enough fluids. Monitoring these changes is important. If unusual colors persist for several days, it is advisable to consult a healthcare provider to determine if kidney function is involved.

15. Urine Appearance

Changes in urine consistency can be an important sign of kidney issues. Urine may appear foamy or bubbly, which can indicate the presence of excess protein leaking into the urine. This often happens when the kidneys are damaged and unable to properly filter waste.

Changes in urine color can also signal a problem. Dark brown, tea-colored, or reddish urine may show the presence of blood or waste that your kidneys can’t properly filter. While these changes can sometimes result from other causes, they may also signal problems with kidney function.

Monitoring the consistency and color of urine can provide valuable information about kidney health. If you notice persistent foamy urine, discoloration, or any unusual changes, it is important to consult a healthcare provider for further evaluation. Routine blood and urine tests can help find problems early before they become more serious.

16. Insomnia

Kidney disease can cause noticeable changes in your sleep. Waste builds up in your blood when your kidneys do not work well, affecting brain chemicals that control sleep and alertness. As a result, many people find it hard to fall asleep or stay asleep.

Insomnia often links to symptoms such as muscle cramps, itching, or restless legs, which become worse at night and make it difficult to get enough rest. You might feel tired during the day yet still struggle to sleep at night. You may have lower energy, find it harder to focus, and feel more irritable. Poor sleep can also make other symptoms, such as fatigue or stress, seem more intense.

Maintaining a regular sleep schedule and establishing a calm bedtime routine can help improve sleep quality. Avoiding caffeine late in the day and keeping the bedroom quiet and dark are also beneficial.