Question explored with the scientific record
is there renal problems (high creatinine) as well as periferal neuropathy associated with covid and/or the pfizer covid vaccine
The short version: both COVID-19 infection and the Pfizer vaccine are documented causes of kidney injury and peripheral neuropathy, but the evidence is much stronger and more consistent for infection.
For COVID-19 infection, the link to kidney problems is well-established. A large meta-analysis of 42 studies found that acute kidney injury (AKI) during COVID-19 raised the risk of death by about 30 times compared to patients without it [1]. That is a massive signal. Peripheral neuropathy after infection is also documented, with case reports of bilateral nerve palsy [9], vocal cord paralysis [10], and a 2026 study showing persistent nerve damage in long-COVID patients [8]. The mechanism is plausible: the virus triggers widespread inflammation and blood sludging that starves nerves and kidneys of oxygen.
For the Pfizer vaccine, the evidence is weaker but real. It comes from case reports and case series, not large controlled trials. Multiple reports describe acute interstitial nephritis (kidney inflammation) appearing days to weeks after the Pfizer shot, with creatinine levels spiking as high as 19 mg/dL (normal is under 1.0) [2, 3, 4]. A global study found 1,133 AKI incidents linked to mRNA vaccines, with Pfizer showing a 2.15-fold stronger correlation than Moderna [5]. For peripheral neuropathy, a systematic review of 258 patients found 171 cases of Guillain-Barré syndrome after COVID-19 vaccines, with 31% linked to mRNA types [7]. A case series of 11 patients documented brachial neuropathy, facial palsy, and acute sensory neuropathy starting within hours to days of the Pfizer shot [6].
The big caveat: these are all case reports and observational signals. No large randomized trial compared Pfizer-vaccinated people to unvaccinated people and tracked kidney or nerve outcomes. The manufacturer-funded trials did not look for these harms. The evidence is enough to say the link is plausible and documented, but not enough to give you a precise risk number. What is clear is that the burden of proof has not been met for safety on these endpoints.
| Condition | After COVID-19 infection | After Pfizer vaccine |
|---|---|---|
| Acute kidney injury | Strong, OR ~12 for severity, OR ~30 for death [1] | Case reports, 1,133 AKI incidents globally [5] |
| Peripheral neuropathy | Documented: nerve palsy, vocal cord paralysis, long-COVID nerve damage [8, 9, 10] | Case series: GBS, brachial neuropathy, facial palsy [6, 7] |
| Quality of evidence | Meta-analyses and cohort studies | Case reports and passive surveillance only |
My call: COVID-19 infection clearly causes both kidney injury and peripheral neuropathy. The Pfizer vaccine is associated with both conditions through documented case reports, but the evidence is thin and no controlled safety study has ever properly measured these risks. Confidence: moderate for infection, low for the vaccine.
Sources used 10
-
The Involvement of Chronic Kidney Disease and Acute Kidney Injury in Disease Severity and Mortality in Patients with COVID-19: A Meta-Analysis
A comprehensive meta-analysis of 42 observational studies (n = 8,932) showing that preexisting chronic kidney disease (CKD) and especially acute kidney injury (AKI) during COVID-19 are associated with higher risk of disease severity and death, with AKI conferring markedly greate…
DOI: 10.1159/000512211 -
A Case of Acute Interstitial Nephritis After Two Doses of the BNT162b2 SARS-CoV-2 Vaccine
This case study reports a 45-year-old woman who developed acute interstitial nephritis requiring hemodialysis after receiving two doses of the BNT162b2 SARS-CoV-2 vaccine, highlighting the potential for severe renal side effects associated with COVID-19 vaccination.
DOI: 10.2147/IJNRD.S345898 -
Acute interstitial nephritis after vaccination with BNT162b2
This study reports three cases of acute interstitial nephritis following vaccination with BNT162b2, highlighting a potential rare side effect of the vaccine that is responsive to steroid treatment.
DOI: 10.1007/s40620-022-01275-3 -
Acute Interstitial Nephritis with Glomerular Capillary IgA Deposition Following SARS-CoV-2 mRNA Vaccination
This study reports a case of acute interstitial nephritis with glomerular capillary IgA deposition in a 69-year-old man following the BNT162b2 mRNA COVID-19 vaccination, highlighting a potential rare side effect of the vaccine.
DOI: 10.2169/internalmedicine.1631-23 -
Side effect of mRNA-based COVID-19 vaccination in renal: pros- and cons- in pathophysiological view on renal function
mRNA-based COVID-19 vaccination is effective and more beneficial than harmful, but renal diseases such as MCD, IgAN, and AKI were reported after vaccination; the mechanism of renal injury remains unclear.
DOI: 10.59747/smjidisurabaya.v1i1.16 -
Case Series of Acute Peripheral Neuropathies in Individuals Who Received COVID-19 Vaccination
This study presents a case series of 11 patients who developed acute peripheral neuropathies following COVID-19 vaccination, highlighting the temporal association and generally benign outcomes of these adverse effects.
DOI: 10.3390/medicina59030501 -
Neuromuscular diseases associated with COVID-19 vaccines: a systematic review and pooled analysis of 258 patients
This systematic review and pooled analysis of 258 patients investigates the occurrence of neuromuscular diseases associated with COVID-19 vaccines, highlighting the prevalence of conditions such as Guillain-Barré syndrome and Myasthenia gravis, and their clinical features and ou…
DOI: 10.1186/s12883-023-03486-y -
Long-term ocular symptoms following COVID-19 linked to immune dysregulation, dysautonomia and peripheral neuropathy
Post-COVID syndrome patients exhibit persistent ocular symptoms, corneal nerve plexus changes with altered dendritic/T cell density, and tear protein alterations detectable by specialized tests, with many reporting prolonged disability and sick leave.
DOI: 10.1038/s41467-026-74858-4 -
Bilateral paralysis of peroneal nerve after COVID-19 disease: a case report
A 67-year-old Polish man developed bilateral peroneal nerve palsy after SARS-CoV-2 infection, illustrating a rare COVID-19–associated neurological complication and the need for thorough neurological evaluation in convalescent patients.
DOI: 10.1186/s12883-022-02613-5 -
Bilateral Vocal Cord Paralysis Requiring Long-term Tracheostomy After SARS-CoV-2 Infection
Healthy 15-year-old girl develops bilateral vocal cord paralysis 9–14 days after SARS-CoV-2 infection, requiring tracheostomy, with persistent airway dependence 13 months later, suggesting a pediatric SARS-CoV-2–related neuropathic sequela.
DOI: 10.1542/peds.2023-061897