The short answer: Most people can live a healthy, active life with one kidney, whether they donated a kidney or had one removed because of illness. The remaining kidney usually adapts by filtering more blood. However, having one kidney means you have less reserve if that kidney becomes injured or develops disease. Protecting kidney health, monitoring blood pressure, and attending regular checkups are important.
What Happens When You Have One Kidney?
People may have one kidney because they were born with it, donated a kidney, or underwent a nephrectomy, which is surgery to remove a kidney.
A healthy kidney filters waste from the blood, balances fluids and electrolytes, and helps regulate blood pressure. When one kidney is removed or is not functioning, the remaining kidney can gradually increase its filtering capacity.
This adaptation is called compensatory hypertrophy, meaning the remaining kidney grows or becomes more active to handle a larger share of the workload.
Most healthy people adapt well. However, the remaining kidney does not necessarily replace all the original filtering capacity. Long-term health depends on the kidney’s condition, blood pressure, other medical conditions, and lifestyle.
Does Having One Kidney Increase the Risk of Kidney Disease?
It can, but the risk varies.
Many people with one healthy kidney maintain good kidney function for decades. Living with one kidney does not automatically mean you have chronic kidney disease (CKD).
However, some people develop:
- High blood pressure: Kidney function and blood pressure influence each other.
- Albuminuria: Albumin, a protein normally retained in the blood, appears in the urine.
- Reduced eGFR: The estimated glomerular filtration rate measures how effectively the kidneys filter blood.
The risk may be higher in people with diabetes, obesity, existing kidney disease, uncontrolled hypertension, or certain inherited conditions.
Kidney donors are generally screened carefully before donation. Their long-term risks differ from those of people who had a kidney removed because of cancer, trauma, or existing kidney disease.
How to Protect Your Remaining Kidney
1. Monitor Blood Pressure
High blood pressure can damage the small blood vessels in the kidneys over time.
Check your blood pressure regularly, particularly if you have hypertension or other kidney risk factors. If readings are repeatedly elevated, discuss them with your healthcare professional.
A blood pressure target should be individualized according to your overall health and medical history.
2. Stay Hydrated Without Forcing Extra Water
Drink enough fluids to avoid dehydration, especially during hot weather, exercise, fever, vomiting, or diarrhea.
However, drinking excessive amounts of water does not make a healthy kidney work better. Your fluid needs depend on your activity, climate, medications, and medical conditions.
If you have heart failure or another condition requiring fluid restriction, follow your clinician’s advice.
3. Be Careful With Painkillers
Some medicines can affect kidney function, particularly during dehydration or when used frequently.
Nonsteroidal anti-inflammatory drugs (NSAIDs) include ibuprofen and naproxen. These medicines can reduce blood flow to the kidneys and may cause kidney injury in susceptible people.
Having one kidney does not automatically prohibit every NSAID, but regular or prolonged use deserves medical review. Ask a healthcare professional or pharmacist which pain relief options are appropriate for you.
Do not stop prescribed medicines without medical advice, and tell healthcare professionals that you have one kidney before starting new medicines or supplements.
4. Eat a Balanced Diet
Most people with one healthy kidney do not need a special kidney diet.
Focus on:
- Vegetables and fruits in appropriate portions.
- Whole grains and other high-fiber foods.
- Moderate portions of protein from varied sources.
- Less highly processed food and excess sodium.
- Adequate calories to maintain a healthy weight.
Avoid routinely consuming very high-protein diets or bodybuilding supplements without discussing them with a healthcare professional, especially if kidney function is reduced.
You do not need to eliminate potassium-rich foods or restrict protein severely simply because you have one kidney. Dietary changes should depend on your laboratory results and individual needs.
5. Maintain a Healthy Weight and Exercise Regularly
Regular physical activity supports healthy blood pressure, blood sugar control, cardiovascular health, and weight management.
Walking, swimming, cycling, and strength training are reasonable options for many people.
If you have one kidney, ask your healthcare professional about activities involving a substantial risk of direct kidney injury, particularly collision sports. A solitary kidney does not mean all sports are forbidden, but protective measures and individual risk assessment may be appropriate.
Which Tests Should You Monitor?
Regular follow-up helps identify changes before they cause noticeable symptoms.
Three important checks are:
Blood pressure: High readings may signal an increased risk to kidney health.
Serum creatinine and eGFR: Creatinine is a waste product measured in the blood. The eGFR estimates how well your kidneys filter blood. A lower eGFR may be expected after kidney removal, so the result must be interpreted in context rather than viewed in isolation.
Urine albumin-to-creatinine ratio (UACR): This test checks for small amounts of albumin in the urine. Persistent albuminuria can indicate kidney damage even when eGFR is relatively preserved.
Your clinician may recommend additional tests depending on your medical history, reason for nephrectomy, medications, and previous results.
A single abnormal result does not automatically establish chronic kidney disease. Persistent abnormalities, changes over time, and the overall clinical picture matter.
Can You Live a Normal Life After Kidney Donation or Removal?
In many cases, yes.
Most people with one healthy kidney can work, travel, exercise, and enjoy their usual activities. After recovery from surgery, many return to their normal routines.
However, recovery time and long-term precautions vary depending on why the kidney was removed and whether the remaining kidney is healthy.
People who donated a kidney should continue recommended long-term follow-up. Those who underwent nephrectomy for cancer or another disease may need additional monitoring related to the original condition.
Pregnancy is also possible for many people with one kidney, although the risk of high blood pressure and preeclampsia may be increased. Anyone planning pregnancy should discuss monitoring and individualized risks with their healthcare team.
When Should You Seek Medical Attention?
Contact a healthcare professional if you notice persistent changes such as:
- Blood in your urine.
- New or worsening swelling in your legs or around your eyes.
- Persistently high blood pressure.
- A substantial or unexplained change in urine output.
- Persistent foamy urine, particularly if urine testing has not been performed.
Seek urgent medical care for very little or no urine, severe shortness of breath, confusion, or severe weakness, particularly if these symptoms develop suddenly or occur with significant illness or dehydration.
Do not wait for symptoms to appear before arranging routine kidney monitoring. Kidney problems can develop without obvious early warning signs.
Bottom Line
Living with one kidney is usually compatible with a healthy, active life. The remaining kidney can adapt, but protecting it matters because there is less reserve if kidney function declines.
Monitor blood pressure, check kidney function and urine albumin as recommended, maintain a balanced diet, avoid dehydration, and review potentially kidney-affecting medicines with a healthcare professional.
The most important step is consistent follow-up tailored to your reason for having one kidney and the health of the kidney that remains.