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Scientists discover strange link between low vitamin D and pain | ScienceDaily (opens in a new tab)

sciencedaily.com · 2026-09-14

Short answerEvidenceSource

Short answer

Mostly not supported

Mostly not supported.

One claim goes further than the study. 3 other points were not covered by the paper.

  • 1 supported
  • 1 overstated
  • 3 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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NewsLink checks it

Mostly not supported

One claim overstates the study. One of five checks out. Three claims the study doesn't address.

  • 1 supported
  • 1 overstated
  • 3 not covered
Open claim evidence
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Then inspect each claim

Evidence layer

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5 claims in this story

Showing all 5 claimsChoose a verdict to focus the list.

Claim 1 of 5OverstatedLow vitamin D levels may make recovery from breast cancer surgery more painful and increase the need for opioid painkillers.View evidenceHide evidence

Why this verdict

The paper profile supports an association between vitamin D deficiency and more acute postoperative pain plus greater opioid use. However, the headline-style wording that low vitamin D levels “may make” recovery more painful implies a causal role beyond what this single-center observational cohort can establish. The story body’s caveats appear more cautious than the headline framing.

1

Study evidence

Vitamin D–deficient patients had a higher occurrence of moderate–severe postoperative pain at 12 hours (NRS >3).

“Association between preoperative vitamin D level and postoperative pain in patients undergoing breast cancer surgery: a prospective observational study”
2

Study evidence

Vitamin D–deficient patients had higher intraoperative fentanyl consumption compared with vitamin D–sufficient patients.Mean difference 8.04 µg (95% CI 3.21 to 12.88)

“Other secondary outcomes included: ... intraoperative fentanyl consumption, postoperative tramadol consumption, sedation scores, intraoperative and postoperative hemodynamics, patient satisfaction, and hospital stay.”
Claim 2 of 5Not coveredPatients with vitamin D deficiency received slightly more fentanyl during surgery and experienced more postoperative nausea as well.View evidenceHide evidence

As stated8 μg more fentanyl

Why this verdict

The fentanyl part is supported by the abstract profile: vitamin D–deficient patients had higher intraoperative fentanyl consumption by 8.04 µg. However, postoperative nausea is not reported in the supplied abstract-level paper profile, so that part of the claim cannot be verified at this evidence depth.

1

Study evidence

Vitamin D–deficient patients had higher intraoperative fentanyl consumption compared with vitamin D–sufficient patients.Mean difference 8.04 µg (95% CI 3.21 to 12.88)

“Other secondary outcomes included: ... intraoperative fentanyl consumption, postoperative tramadol consumption, sedation scores, intraoperative and postoperative hemodynamics, patient satisfaction, and hospital stay.”
Claim 3 of 5Not coveredThe researchers said the study cannot prove cause and effect because it was observational and single-center, and they did not measure inflammatory markers or several other potential confounders.View evidenceHide evidence

Why this verdict

The observational, single-center design and inability to prove causation are supported by the profile limitations. But the specific limitations about inflammatory markers and several named potential confounders are not present in the supplied abstract-level profile, which instead notes residual confounding and unspecified adjustment variables. Those details may require full-text evidence.

1

Study evidence

Vitamin D–deficient patients had a higher occurrence of moderate–severe postoperative pain at 12 hours (NRS >3).

“Association between preoperative vitamin D level and postoperative pain in patients undergoing breast cancer surgery: a prospective observational study”
2

Study evidence

Vitamin D–deficient patients had higher intraoperative fentanyl consumption compared with vitamin D–sufficient patients.Mean difference 8.04 µg (95% CI 3.21 to 12.88)

“Other secondary outcomes included: ... intraoperative fentanyl consumption, postoperative tramadol consumption, sedation scores, intraoperative and postoperative hemodynamics, patient satisfaction, and hospital stay.”
Claim 4 of 5Not coveredThe researchers concluded that vitamin D deficiency is associated with a higher occurrence of moderate to severe postoperative pain and increased opioid consumption in patients undergoing unilateral modified radical mastectomy, and suggested preoperative vitamin D supplementation may have a role.View evidenceHide evidence

Why this verdict

The association between vitamin D deficiency, higher moderate–severe postoperative pain, and increased opioid consumption is supported by the abstract profile. The added statement that the researchers suggested preoperative vitamin D supplementation may have a role is not present in the supplied abstract-level profile, and the study did not test supplementation as an intervention.

1

Study evidence

Vitamin D–deficient patients had a higher occurrence of moderate–severe postoperative pain at 12 hours (NRS >3).

“Association between preoperative vitamin D level and postoperative pain in patients undergoing breast cancer surgery: a prospective observational study”
2

Study evidence

Vitamin D–deficient patients had higher intraoperative fentanyl consumption compared with vitamin D–sufficient patients.Mean difference 8.04 µg (95% CI 3.21 to 12.88)

“Other secondary outcomes included: ... intraoperative fentanyl consumption, postoperative tramadol consumption, sedation scores, intraoperative and postoperative hemodynamics, patient satisfaction, and hospital stay.”
Claim 5 of 5SupportedIn a study of 184 women undergoing mastectomy, patients with vitamin D deficiency were three times more likely to experience moderate to severe pain during the first 24 hours after surgery and also used substantially more tramadol.View evidenceHide evidence

As statedthree times more likely; 112 mg more tramadol stated as substantial

Why this verdict

The abstract profile reports 184 women undergoing unilateral modified radical mastectomy and an adjusted OR of 3.12 for moderate–severe pain at any time in the first 24 hours among vitamin D–deficient patients, which supports the “about three times” association. It also reports greater postoperative tramadol consumption, mean difference 112.17 mg. Strictly, the paper reports an odds ratio rather than a risk ratio, but the claim is broadly aligned with the abstract evidence.

1

Study evidence

Vitamin D–deficient patients had a higher occurrence of moderate–severe postoperative pain at 12 hours (NRS >3).

“Association between preoperative vitamin D level and postoperative pain in patients undergoing breast cancer surgery: a prospective observational study”
2

Study evidence

Vitamin D–deficient patients had higher intraoperative fentanyl consumption compared with vitamin D–sufficient patients.Mean difference 8.04 µg (95% CI 3.21 to 12.88)

“Other secondary outcomes included: ... intraoperative fentanyl consumption, postoperative tramadol consumption, sedation scores, intraoperative and postoperative hemodynamics, patient satisfaction, and hospital stay.”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • The abstract profile does not report postoperative nausea results, inflammatory-marker measurement, or the specific named confounders listed by the story.

    These story details are not verifiable from the supplied abstract-level paper profile. They may come from full text, but at the requested evidence depth they are not reflected in the paper profile evidence.

6 things the story did carry across
  • The paper is a prospective observational, single-center cohort of 184 women undergoing unilateral modified radical mastectomy, grouped by preoperative serum 25(OH)D deficiency versus sufficiency.
  • Vitamin D deficiency was associated with moderate–severe postoperative pain during the first 24 hours, with an adjusted OR of 3.12 reported for the 24-hour composite pain outcome.
  • Vitamin D–deficient patients had greater opioid consumption, including higher intraoperative fentanyl use and higher postoperative tramadol use.
  • The study’s observational design precludes causal inference and leaves potential for residual confounding despite multivariable adjustment and baseline balance.
  • The study was conducted at a single center, limiting generalizability.
  • The abstract reports only acute postoperative outcomes up to 24 hours; longer-term pain outcomes are not reported at abstract depth.
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Study layer

Study at a glance

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Pieces of work

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Evidence read

study summary

Lead result

human in vivo

1Lead resulthuman in vivoDetermine whether preoperative serum vitamin D deficiency is associated with greater acute postoperative pain after unilateral modified radical mastectomy (eg, moderate–severe pain at 12 hours and within 24 hours).Prospective observational cohortExpand

In plain English

Prospective observational cohort of 184 women undergoing elective unilateral modified radical mastectomy classified by preoperative serum 25(OH)D (<30 nmol/L vs ≥30 nmol/L). Vitamin D deficiency was associated with a higher occurrence of moderate–severe acute postoperative pain and greater opioid consumption; multivariable analysis showed an adjusted OR 3.12 (95% CI 1.58–6.13) for moderate–severe pain at any time within the first 24 hours. Deficient patients had higher intraoperative fentanyl use and greater postoperative tramadol consumption (mean differences and 95% CIs reported).

Key findings

  • Vitamin D–deficient patients had a higher occurrence of moderate–severe postoperative pain at 12 hours (NRS >3).
  • Preoperative vitamin D deficiency was independently associated with moderate–severe postoperative pain at any time within the first 24 hours in multivariable analysis.adjusted OR 3.12 (95% CI 1.58 to 6.13)
“Association between preoperative vitamin D level and postoperative pain in patients undergoing breast cancer surgery: a prospective observational study”
What this piece can’t prove
  • Single-center study of women undergoing unilateral modified radical mastectomy (limits generalizability).
  • Observational cohort design — subject to residual confounding despite multivariable adjustment and reported baseline balance.

2 further details could not be confirmed from the summary.

2human in vivoAssess whether vitamin D deficiency is associated with greater perioperative opioid/analgesic requirements and related perioperative recovery measures (eg, intraoperative fentanyl, postoperative tramadol, sedation, hemodynamics, satisfaction, length of stay).Prospective observational cohortExpand

In plain English

In a prospective single-center observational cohort of 184 female patients undergoing unilateral modified radical mastectomy (92 vitamin D–deficient [<30 nmol/L] vs 92 vitamin D–sufficient [≥30 nmol/L]), vitamin D deficiency was associated with greater perioperative opioid consumption: a higher intraoperative fentanyl use (mean difference 8.04 µg, 95% CI 3.21 to 12.88) and greater postoperative tramadol use (mean difference 112.17 mg, 95% CI 101.44 to 122.91). The study also measured sedation scores, intra- and postoperative hemodynamics, patient satisfaction, and hospital stay as secondary outcomes, but the abstract reports results only for opioid consumption.

Key findings

  • Vitamin D–deficient patients had higher intraoperative fentanyl consumption compared with vitamin D–sufficient patients.Mean difference 8.04 µg (95% CI 3.21 to 12.88)
  • Vitamin D–deficient patients had higher postoperative tramadol consumption compared with vitamin D–sufficient patients.Mean difference 112.17 mg (95% CI 101.44 to 122.91)
“Other secondary outcomes included: ... intraoperative fentanyl consumption, postoperative tramadol consumption, sedation scores, intraoperative and postoperative hemodynamics, patient satisfaction, and hospital stay.”
What this piece can’t prove
  • Prospective observational single-center study—subject to confounding and limited generalizability.
  • Abstract provides limited methodological detail on measurement timing, analgesic protocols, and whether opioid consumption comparisons were adjusted for covariates.

1 further detail could not be confirmed from the summary.

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