What Are the Long-Term Side Effects of Having a Kidney Removed?

Losing a kidney, whether to cancer surgery, donation, or traumatic injury, triggers a cascade of changes in your body that unfold over months and years. The remaining kidney grows and works harder to compensate, and most people live long, healthy lives afterward. But “most people do fine” is not the same as “nothing changes.” Over the long term, living with a single kidney carries a modestly elevated risk of high blood pressure, protein in the urine, reduced overall kidney function, and in rare cases, kidney failure. How much these risks matter depends heavily on why the kidney was removed, how healthy you were beforehand, and how you manage your health going forward.

What Happens to the Remaining Kidney

Within days of losing a kidney, the surviving one begins to enlarge. This compensatory growth is remarkably fast: in animal models, the remaining kidney’s weight plateaus at roughly 23% above baseline within about ten days, and the growth is genuine tissue expansion rather than just fluid accumulation.¹ In humans, this process takes a bit longer but follows the same pattern. The kidney’s filtering units and tubules physically enlarge, and each unit ramps up its individual workload. Over weeks to months, total filtration capacity climbs back toward what two kidneys used to provide together.²

This adaptation is both the good news and the source of long-term concern. The very mechanisms that restore your filtration rate, each filtering unit working overtime, can eventually contribute to kidney injury and high blood pressure.² Think of it as asking one employee to permanently do two people’s jobs: they can manage, sometimes for decades, but the strain accumulates.

How Much Kidney Function Do You Actually Recover

If you had normal kidney function before surgery, you should expect an immediate drop in your filtration rate, followed by a gradual partial rebound. A large multi-center study tracking patients after radical nephrectomy for kidney cancer found that roughly 42% of patients recovered to their pre-surgery filtration rate by one year, and about 45% by two years.³ That means more than half of patients settled at a permanently lower baseline. Interestingly, people who started with somewhat reduced kidney function before surgery were actually more likely to bounce back: about two-thirds of those patients recovered their pre-operative levels by two years, compared with only about a third of those who started with normal function.³

Among kidney donors studied an average of twelve years after donation, about 86% maintained a filtration rate above the threshold used to define chronic kidney disease.⁴ That sounds reassuring, and it mostly is, but it also means around one in seven donors eventually dipped below that line. The practical question is whether that reduced filtration leads to real clinical problems, and the evidence says it sometimes does.

The Risk of Kidney Failure

This is the question that concerns people most, and the honest answer is that the risk exists but remains small in absolute terms. A landmark U.S. study following more than 96,000 kidney donors estimated that the 15-year risk of end-stage kidney disease (the point where you need dialysis or a transplant) was about 31 per 10,000 donors, compared with roughly 4 per 10,000 among matched healthy non-donors.⁵ That represents a meaningful relative increase, but still under 1% of donors in absolute terms. And importantly, the estimated lifetime risk for donors was about 90 per 10,000, which is still far lower than the 326 per 10,000 seen in the general unscreened population.⁵ Kidney donors are preselected for excellent health, so they start from a better baseline than the average person.

The causes of kidney failure in donors shift over time. In the first decade, the cases that do occur tend to involve glomerular disease, a problem with the filtering units themselves. By 25 years out, diabetes and hypertension become the primary drivers.⁶ This underscores something practical: managing blood sugar and blood pressure over the decades matters more than worrying about the surgery itself.

A Norwegian study, with a longer average follow-up of fifteen years, found a notably higher relative risk of kidney failure in donors compared with non-donors who could have donated but chose not to.⁶ The absolute numbers were still small, but the discrepancy between studies reflects differences in follow-up length, comparison groups, and healthcare systems. The takeaway is consistent across both: the risk is real but low, and it rises gradually the further out you go.

Blood Pressure Changes

Hypertension is one of the more common long-term findings after losing a kidney. In the large donor study mentioned above, about 32% of donors had developed hypertension roughly twelve years after donating, with older age and higher body weight being the strongest predictors.⁴ Time since donation, curiously, was not independently linked to hypertension risk in that study, suggesting the blood pressure rise may reflect aging and weight gain more than the surgery itself.

But the picture is more nuanced than average readings suggest. A study using 24-hour ambulatory blood pressure monitoring found that while average daytime and nighttime pressures did not change significantly after nephrectomy, the normal nighttime dip in blood pressure was blunted. After surgery, more patients shifted from a healthy “dipper” pattern to a “non-dipper” or even “riser” pattern, where blood pressure stays flat or climbs at night.⁷ Non-dipping patterns are associated with higher cardiovascular risk over time, even when office blood pressure readings look normal. If you have a single kidney, it is worth asking your doctor about overnight blood pressure patterns, not just the readings you get in the clinic.

Protein in the Urine

Proteinuria, the leakage of protein into your urine, is both a consequence of a single overworked kidney and a warning sign for further decline. After radical nephrectomy (removal of an entire kidney for cancer), about 27% of patients developed proteinuria in one comparative study.⁸ Among kidney donors, roughly 13% showed albuminuria (a specific type of protein leak) about twelve years out, and the likelihood increased with time since donation.⁴

Proteinuria matters because it is independently associated with worse survival. In a study of patients who had kidney cancer surgery, those who developed proteinuria had a five-year overall survival rate of about 65%, compared with 77% for those without it.⁹ Regular urine tests can catch this early, and treatments that control blood pressure, particularly drugs that act on the renin-angiotensin system, can slow the progression.

Does Losing a Kidney Raise Your Cardiovascular Risk

The relationship between nephrectomy and heart health is one of the more debated areas. It has been argued that chronic kidney disease of any cause, including surgical removal, carries higher cardiovascular and mortality risk.¹⁰ For kidney cancer patients specifically, one study found that those who had their entire kidney removed for small tumors (two centimeters or less) had roughly double the overall mortality and about two and a half times the cardiovascular mortality of those who had a partial removal instead.¹¹

However, other research has found no significant difference in adverse cardiovascular outcomes between the two surgical approaches.¹² The contradiction probably reflects differences in patient populations, follow-up durations, and how cardiovascular outcomes were defined. What seems clear is that the risk, if it exists, is mediated largely through the kidney function drop itself: the lower your post-surgery filtration rate, the higher your downstream cardiovascular risk. Patients who preserved more kidney tissue generally fared better, with one study reporting a mean one-year filtration rate of 71 in the partial nephrectomy group versus 52 in the radical group.¹³

Partial Versus Radical Removal

This distinction matters more than many patients realize. A partial nephrectomy removes only the diseased portion of the kidney, preserving the rest. A radical nephrectomy removes the whole organ. For small kidney tumors, partial removal is now the preferred approach precisely because it preserves more filtration capacity and is associated with better kidney function at one and three years after surgery.¹⁴ Patients who had radical surgery for small tumors also had higher proteinuria levels afterward.⁸

If your doctor recommends removing your entire kidney, it is worth asking whether a partial removal is feasible. For large or centrally located tumors, it often is not, and the priority shifts to cancer clearance. But for tumors where both approaches are oncologically equivalent, preserving kidney tissue pays long-term dividends in filtration, blood pressure, and potentially cardiovascular health.

Pregnancy After Kidney Removal

Women who have had a kidney removed can and do have successful pregnancies, but the data shows some elevated risks compared with the general population. A study of postdonation pregnancies found that gestational hypertension occurred in about 5.7% of postdonation pregnancies compared with 0.6% of predonation ones, and preeclampsia occurred in 5.5% versus 0.8%. Gestational diabetes, fetal loss, and preterm delivery were also more common after donation.¹⁵

A Korean population-based study found a similar pattern: the rate of gestational hypertension or preeclampsia was about 9% in donors compared with about 2% in non-donors, though severe cases requiring medication were not significantly different between the groups. Rates of low birth weight, stillbirth, and ectopic pregnancy were comparable, and no maternal deaths occurred among donors.¹⁶ The practical message for women planning pregnancy after nephrectomy is that close monitoring is warranted, particularly for blood pressure and urine protein, but the outcomes are generally good when these complications are caught and managed.

Quality of Life and Psychological Health

Given how much attention the physical risks get, it is worth noting that most research on quality of life after kidney removal paints a surprisingly positive picture. A systematic review and meta-analysis found that kidney donors’ physical quality-of-life scores dipped in the first three months after surgery but returned to baseline by six months. Mental health scores did not change at any measured time point. Across all measures, donors scored as well as or better than the general population.¹⁷

Long-term studies tell a similar story. One found that donors scored high on quality-of-life scales, with mean scores ranging from 64 to 91 out of 100 across different domains. Recognition from family and friends was linked to even higher scores. Fatigue levels were generally low, though the small minority of donors who regretted their decision reported more fatigue across the board. Whether the recipient was still alive also influenced donors’ retrospective willingness to donate.¹⁸ Another single-center study found that donors had higher quality-of-life scores than the general population on both physical and mental dimensions.¹⁹

These findings likely reflect a selection effect: donors are screened for excellent physical and mental health, and people who volunteer to donate a kidney tend to have strong social support and a sense of purpose. For people who lost a kidney to cancer or trauma, the psychological picture can be more mixed, though the physical quality-of-life trajectory is broadly similar.

Diet and Lifestyle After Nephrectomy

Living with one kidney does not require a dramatically different lifestyle, but some adjustments are worth making. Current expert recommendations for people with a single kidney include keeping daily protein intake to no more than about one gram per kilogram of body weight, limiting sodium to under four grams per day, eating plenty of fiber from plant-based foods, and maintaining a body mass index under 30.²⁰ The protein recommendation sometimes surprises people, especially those who exercise heavily or follow high-protein diets. The concern is that excessive protein forces the remaining kidney to filter more waste products, accelerating the very hyperfiltration stress that causes problems over time.

Staying hydrated, avoiding unnecessary use of anti-inflammatory painkillers (which can stress the kidney), and managing blood pressure aggressively if it starts creeping up are all part of the playbook. Regular blood work and urine tests, at least annually, help catch early changes in filtration or protein leakage before they become serious.

Sports and Physical Activity With a Single Kidney

One of the most persistent misconceptions about living with one kidney is that you need to avoid contact sports entirely. Many pediatric kidney specialists have traditionally restricted children with a single kidney from football, wrestling, and similar activities. But the evidence supporting a blanket ban is thin. A review of sports-related kidney injuries found that catastrophic kidney injuries occurred at a rate of roughly 0.4 per million children per year across all sports, and cycling caused more than three times as many kidney injuries as football.²¹ The authors concluded that blanket restrictions on contact sports for people with a single normal kidney were unwarranted.

A more recent systematic review reinforced this position, recommending against absolute sport restrictions for children with a solitary kidney. Instead, it advocates for shared decision-making between the patient, family, and doctor, accounting for the specific sport, the child’s anatomy, and individual risk tolerance.²² While motorized sports and horseback riding carry somewhat higher trauma risks, even those activities may be appropriate for some individuals when the psychosocial benefits are weighed against the small probability of injury. The remaining kidney sits deep in the body, protected by the ribcage, spine, and surrounding muscle. Wearing a protective flak jacket during contact sports can add an extra margin of safety.

Who Faces Higher Long-Term Risk

Not everyone with a single kidney faces the same odds. Several factors tilt the scales:

Reason for removal: Kidney donors are prescreened for health and tend to have the best outcomes. People who lost a kidney to cancer face added complexity because they may need surveillance for recurrence and may have had underlying conditions that contributed to the tumor. Those who lost a kidney to trauma often had no screening advantage going in.
Age and weight: Older age and higher body mass at the time of surgery are consistently linked to lower kidney function and more hypertension in the years following nephrectomy.
Race: Black kidney donors face a higher absolute risk of kidney failure than white donors. The U.S. donor study estimated a 15-year kidney failure risk of about 75 per 10,000 in Black donors compared with about 23 per 10,000 in white donors.⁵ This likely reflects the higher background rates of hypertension and kidney disease in Black Americans, but it makes closer follow-up especially important.
Baseline kidney function: If you already had reduced function before losing a kidney, the remaining one starts from a lower capacity. These individuals need tighter monitoring, though as noted, they sometimes show a proportionally larger compensatory rebound.

What Monitoring Looks Like Long-Term

If you have a single kidney, ongoing surveillance is straightforward but important. Most guidelines recommend annual blood tests to check your filtration rate, a urine test for protein, and blood pressure checks. If any of these starts trending in the wrong direction, your doctor can intervene early with blood pressure medications, dietary changes, or referral to a kidney specialist. The goal is not to live in fear of the remaining kidney failing, because the odds strongly favor it working well for the rest of your life. The goal is to catch the slow, gradual changes early enough that they stay manageable rather than compounding into something serious over decades.

1
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2
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PubMed Central. The Effects of Unilateral Nephrectomy on Blood Pressure and Its Circadian Rhythm
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PubMed Central. Incidence of Proteinuria Post Radical Nephrectomy in Comparison to Partial Nephrectomy: A Comparative Study
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