Can STIs Cause Kidney Damage?
Yes, sexually transmitted infections can cause significant kidney damage, with HIV being the most important culprit, capable of causing both acute and chronic kidney disease through multiple mechanisms including direct viral effects, immune-mediated injury, and antiretroviral drug toxicity. 1
HIV: The Primary STI Causing Kidney Disease
HIV infection poses the greatest risk for kidney damage among all STIs. The spectrum of HIV-related kidney disease is extensive and includes:
Direct HIV-Related Kidney Pathology
HIV-associated nephropathy (HIVAN) represents the classic kidney disease directly caused by HIV, characterized by:
- Focal segmental glomerulosclerosis (FSGS) with collapsing features
- Podocyte injury with extensive foot process effacement
- Tubular microcysts and tubulointerstitial inflammation
- Rapid progression to end-stage kidney disease if untreated 1
While HIVAN has become less common with widespread antiretroviral therapy (ART), HIV-positive individuals remain at increased risk for multiple other kidney diseases including:
- Non-collapsing FSGS
- Immune complex-mediated glomerulonephritis (IgA nephropathy, membranous nephropathy, membranoproliferative glomerulonephritis)
- Acute tubular injury from ischemic or toxic causes
- Thrombotic microangiopathy 1
Genetic Susceptibility
APOL1 risk alleles dramatically increase kidney disease risk in people of African descent with HIV. Individuals carrying two copies of APOL1 risk variants (G1 or G2) have substantially higher rates of HIVAN and FSGS, with more rapid progression to end-stage kidney disease 1. This genetic factor helps explain why HIV-related kidney disease disproportionately affects African Americans.
Antiretroviral Drug Toxicity
A critical caveat: The medications used to treat HIV can themselves cause kidney damage. Tenofovir disoproxil fumarate (TDF), a widely used antiretroviral, can cause:
- Proximal tubular dysfunction with phosphate wasting
- Acute tubular necrosis
- Progressive decline in kidney function 1
Other antiretrovirals linked to kidney injury include atazanavir, indinavir, and lopinavir/ritonavir, which can cause interstitial nephritis, nephrolithiasis, and accelerated eGFR decline 1, 2.
Other STIs and Kidney Involvement
Hepatitis B and C
Hepatitis B and C coinfection with HIV increases CKD risk 2- to 3-fold 1. These viruses can cause:
- Membranous nephropathy (HBV)
- Membranoproliferative glomerulonephritis (HCV)
- Cryoglobulinemic vasculitis (HCV) 1
Syphilis
Syphilis can cause kidney disease during secondary syphilis, with membranous nephropathy being the most commonly reported glomerular lesion 3. Other manifestations include tubular pathology and vasculitic lesions, though renal involvement remains relatively rare.
Chlamydia
Chlamydia trachomatis has been associated with chronic or recurrent urinary tract infections that may lead to chronic renal interstitial inflammation 4. However, this represents a less common and less severe form of kidney involvement compared to HIV.
Clinical Approach to Screening and Monitoring
All HIV-positive individuals require kidney disease screening at diagnosis and regular monitoring thereafter 1:
Initial Assessment
- Serum creatinine with eGFR calculation (CKD-EPI equation preferred)
- Urinalysis to detect proteinuria or hematuria
- Quantification of proteinuria (urine albumin:creatinine or protein:creatinine ratio)
Ongoing Monitoring Frequency
- Low CKD risk: Yearly if clinically stable and virologically suppressed
- High CKD risk: Twice yearly
- On TDF with ritonavir or cobicistat: Twice yearly with additional monitoring of serum phosphorus and urinalysis for glycosuria 1
Important Monitoring Caveats
Be aware that certain antiretrovirals (dolutegravir, rilpivirine, ritonavir, cobicistat) can reduce calculated creatinine clearance by 5-20 mL/min through inhibition of tubular creatinine secretion without actual kidney damage—this is a measurement artifact, not true kidney injury 1.
Risk Stratification
Key risk factors for CKD in HIV-positive individuals include:
- Black race (particularly with APOL1 risk alleles)
- Low CD4+ cell count
- High viral load
- Hypertension and diabetes
- Hepatitis B or C coinfection
- Use of nephrotoxic antiretrovirals (especially TDF)
- History of severe acute kidney injury 1, 5
Treatment Implications
Antiretroviral therapy itself reduces the risk of HIVAN and should be initiated promptly 1, 2. However, in patients with established CKD or high CKD risk, avoid or switch from:
- TDF (consider tenofovir alafenamide [TAF] instead)
- Atazanavir
- Lopinavir/ritonavir 1
The bottom line: HIV is the STI most capable of causing serious, progressive kidney damage through multiple mechanisms, and all HIV-positive individuals require systematic kidney disease screening and monitoring throughout their lifetime 1, 6.