Cold weather, hot showers, harsh soaps, dehydration, aging, and dermatological conditions can all cause dryness.

But significant kidney disease can sometimes be associated with dry, itchy skin.

If dry skin develops together with swelling, fatigue, changes in urination, or persistent itching, a medical evaluation may be appropriate.

9. Changes in Urination Frequency

Your normal urination pattern can vary depending on how much you drink, medications, weather, physical activity, and other factors.

But a noticeable and persistent change deserves attention.

Some people with kidney problems may experience more frequent urination, particularly at night.

Others with severe kidney dysfunction may produce significantly less urine.

Neither pattern is specific to kidney disease.

For example, frequent urination can occur with diabetes or urinary infections, while reduced urine output can occur with dehydration or urinary obstruction.

That's why the context matters.

10. Waking Up Frequently to Urinate

Getting up once at night to urinate can happen normally, especially as people get older.

But repeatedly waking several times every night to urinate—particularly if this is a new development—may warrant investigation.

Nighttime urination, known as nocturia, can be associated with kidney disease because damaged kidneys may become less capable of concentrating urine.

However, it can also occur with:

• Enlarged prostate

• Diabetes

• Heart problems

• Sleep apnea

• Certain medications

• Drinking large amounts of fluid before bed

Persistent nocturia should be discussed with a healthcare professional rather than automatically attributed to aging.

11. Unexplained Puffiness or Rapid Changes in Body Fluid

Kidney problems can affect the body's ability to maintain appropriate fluid balance.

This may result in swelling that develops in more than one area.

You might notice:

• Rings becoming tighter

• Shoes fitting differently

• Puffy eyelids

• Swollen ankles

• Rapid increases in body weight

A sudden increase in weight over a short period can sometimes reflect fluid retention rather than an increase in body fat.

But fluid retention has many possible causes, so it should be assessed in context.

12. Muscle Cramps or Twitching

Kidney disease can affect the balance of minerals and electrolytes such as calcium and phosphorus, particularly when kidney function becomes significantly reduced.

As a result, some people may experience:

• Muscle cramps

• Twitching

• Weakness

• Restlessness in the legs

However, cramps are incredibly common.

They can occur after exercise, dehydration, prolonged standing, medication use, or changes in electrolyte levels unrelated to kidney disease.

Persistent or severe muscle symptoms should be evaluated rather than self-diagnosed.

13. Unusual Fatigue or Weakness

Fatigue can be one of the most frustrating symptoms because it has so many possible explanations.

In advanced chronic kidney disease, fatigue may occur because of anemia, buildup of waste products, sleep disturbances, inflammation, or other metabolic changes.

Someone might feel tired despite getting what seems like enough sleep.

They may have less energy for ordinary activities or find physical exertion more difficult.

Fatigue alone does not indicate kidney disease.

But persistent unexplained fatigue combined with changes in urination, swelling, itching, nausea, or high blood pressure warrants a conversation with a healthcare professional.

14. Nausea, Poor Appetite, or a Metallic Taste

When kidney function becomes severely impaired, waste products can accumulate in the bloodstream.

This can contribute to symptoms such as:

• Nausea

• Poor appetite

• An unpleasant or metallic taste

• Food tasting different

• Unintentional weight loss

These symptoms generally occur in more advanced illness rather than being reliable early warning signs.

They can also result from gastrointestinal conditions, medications, infections, dental problems, and many other causes.

Persistent nausea or unexplained appetite changes should therefore be investigated rather than automatically blamed on the kidneys.

15. Breathlessness

Severe kidney disease can sometimes contribute to shortness of breath.

There are several possible mechanisms.

Fluid accumulation can affect the lungs, while anemia can reduce the blood's oxygen-carrying capacity.

People with kidney disease may also have cardiovascular conditions that contribute to breathlessness.

But shortness of breath is a symptom that has many potentially serious causes.

Sudden or severe difficulty breathing requires urgent medical attention, particularly if it occurs with chest pain, confusion, fainting, or bluish lips.

16. Difficulty Concentrating or Feeling Mentally Foggy

In advanced kidney failure, significant accumulation of waste products can affect the nervous system.

A person may experience:

• Difficulty concentrating

• Sleepiness

• Confusion

• Problems thinking clearly

• Reduced alertness

These symptoms are not typical signs of mild kidney disease.