7 Everyday Risk Factors Linked to Kidney Health

Chronic kidney disease (CKD) rarely has a single cause. It’s more often the cumulative result of several overlapping risk factors, some of which have nothing obviously to do with the kidneys at all. A meta-analysis of CKD stages 3–5 across low- and middle-income Asian countries, published in PLoS ONE, quantified how strongly a range of factors associate with CKD risk using odds ratios — a measure of how much more likely a group with the risk factor is to have the condition compared with a group without it. Here’s what that data, and related research, shows.

1. Resistant and severe hypertension

Hypertension is consistently one of the strongest CKD risk factors, and severity matters. In the cited meta-analysis, Stage 3 hypertension carried an odds ratio of 3.55, while resistant hypertension — blood pressure that stays elevated despite treatment with multiple medications — carried an odds ratio of 9.42, by far the highest figure in the dataset. Separate research tracking mean arterial pressure against the rate of GFR decline found a clear dose-response relationship: as blood pressure rises, the rate of kidney function loss accelerates in step (r = 0.69, P < 0.05). Hypertension isn’t just a bystander here — the kidney is both a contributor to blood pressure regulation and one of its most exposed targets.

2. Older age

Every additional decade of life past 30 was associated with an odds ratio of 3.79 for CKD in the same analysis — a reminder that kidney function naturally declines with age, and that age compounds the effect of other risk factors rather than acting alone.

3. Diabetes

Diabetes carried an odds ratio of 3.2, and separately, US data attributes 43% of all end-stage kidney disease cases to diabetic kidney disease — making it the single largest identified cause. We cover the diabetes-kidney relationship in more depth in a companion article, but the short version is that sustained high blood sugar directly damages the kidney’s filtering structures.

4. Anaemia

Anaemia showed an odds ratio of 2.8. The relationship runs in both directions: anaemia is a recognised risk factor for CKD onset and progression, and it’s also one of the most common complications once CKD is established, driven largely by reduced production of the hormone erythropoietin as kidney function declines.

5. Hyperuricemia (elevated uric acid)

With an odds ratio of 2.74, elevated uric acid levels sit close behind cardiovascular disease history (2.76) in this dataset. Research published in Frontiers in Endocrinology in 2024 further describes this as a J- or U-shaped relationship — risk is lowest around a serum uric acid level of roughly 250–300 µmol/L, climbs back to baseline near 420 µmol/L, and rises steeply above about 500–650 µmol/L.

6. Severe sleep apnea

Severe obstructive sleep apnea (OSA) carried an odds ratio of 2.28 in the same meta-analysis, and other research puts OSA prevalence in CKD patients at around 39%, notably higher than in the general population. Singapore-specific data suggests roughly 30% of the population has moderate-to-severe OSA — making this a genuinely relevant local risk factor, not just an abstract statistic. We go into the OSA-kidney link in more detail in a dedicated article.

7. Smoking, obesity, and elevated triglycerides

Rounding out the list, smoking carried an odds ratio of 1.43, hypertriglyceridemia 1.45, and obesity 1.33. Each is more modest on its own than the factors above, but they rarely occur in isolation — someone with obesity, elevated triglycerides, and a smoking history is typically stacking several smaller risks into a meaningfully larger combined one. Proteinuria (protein in the urine), itself often an early sign of kidney damage, was associated with an odds ratio of 1.64.

Why this list matters

None of these risk factors guarantee kidney disease, and several of them — blood pressure, blood sugar, uric acid, sleep apnea, smoking — are at least partially modifiable through medical management and lifestyle change. The practical takeaway from this kind of research isn’t to fixate on a single number, but to recognise that kidney risk tends to accumulate across several fronts at once, which is also why routine screening (an eGFR blood test and a urine albumin check) is recommended for anyone carrying two or more of these factors, even without symptoms.

Frequently asked questions

Which single risk factor matters most for kidney health? Based on the odds ratios in the cited meta-analysis, resistant hypertension (9.42) and increasing age (3.79 per decade past 30) show the strongest associations, followed closely by diabetes (3.2). In practice, though, these factors tend to cluster together rather than acting alone.

Is sleep apnea really a kidney risk factor? Yes — it’s a less intuitive one, but multiple studies have found OSA is both more common in CKD patients than in the general population and independently associated with faster eGFR decline and higher odds of developing CKD. It’s covered in more depth in our dedicated article on sleep apnea and kidney health.

Can these risk factors be reversed? Several of them can be actively managed — blood pressure and blood sugar control, uric acid management, sleep apnea treatment, and smoking cessation are all evidence-based interventions with a body of research behind them. Age itself obviously cannot be changed, which is part of why regular screening becomes more important, not less, as people get older.

This article is for general information only and does not constitute medical advice. If you have one or more of these risk factors, speak to your doctor about appropriate kidney function screening.