Your kidneys help filter waste, balance fluids, control blood pressure, and support several important body functions. Kidney problems can develop gradually, and some warning signs may be easy to miss. Having one of these symptoms does not mean you have kidney disease, but persistent or unexplained symptoms are worth discussing with a healthcare professional.
23 signs your kidneys might be in trouble
- Changes in urination
- Urinating much more or less than usual, especially at night.
- Foamy or bubbly urine
- May indicate excess protein in the urine.
- Blood in the urine
- Pink, red, or tea-colored urine should be checked.
- Swelling in the feet, ankles, or legs
- Kidneys that are not working well may allow fluid to build up.
- Puffiness around the eyes
- Especially noticeable in the morning.
- Persistent fatigue
- Kidney problems can contribute to anemia and toxin buildup, which may cause tiredness.
- Trouble concentrating or feeling mentally foggy
- Waste buildup can affect how you feel and think.
- Loss of appetite
- A reduced desire to eat can occur with advanced kidney problems.
- Nausea or vomiting
- More common when kidney function is significantly reduced.
- Itchy skin
- Waste and mineral imbalances can contribute to itching.
- Dry or irritated skin
- May occur with fluid and mineral changes.
- Muscle cramps
- Electrolyte imbalances can trigger cramps or spasms.
- Back or side pain
- Some kidney conditions, such as kidney stones or infections, may cause pain.
- High blood pressure
- Kidney disease can raise blood pressure, and high blood pressure can also damage kidneys.
- Shortness of breath
- Fluid buildup or anemia related to kidney disease may contribute.
- Metallic taste in the mouth
- Waste buildup can alter taste.
- Bad breath with an unusual odor
- Some people notice a strong or ammonia-like breath smell.
- Feeling cold more often
- Anemia associated with kidney problems may cause increased sensitivity to cold.
- Sleep problems
- Itching, restless legs, or other changes may interfere with sleep.
- Restless legs
- Kidney disease is associated with a higher risk of restless leg symptoms.
- Numbness or tingling
- Nerve problems can occur in some people with chronic kidney disease.
- Changes in urine smell
- Strong or unusual odors can sometimes signal infection or other issues.
- Unexplained weight changes
- Fluid retention can cause rapid weight gain, while illness may cause weight loss.
When to get medical advice
Seek medical attention if you notice:
- Blood in your urine
- Sudden swelling
- Severe side/back pain with fever
- Very little or no urine
- Sudden confusion, extreme weakness, or severe shortness of breath
A simple blood test (such as creatinine/eGFR) and a urine test can help assess kidney function. People with diabetes, high blood pressure, heart disease, or a family history of kidney disease may benefit from regular kidney checks.
