Thyroid cancer diagnoses tripled (US 1975-2009) while mortality stayed flat — an epidemic of diagnosis (overdiagnosis), driving avoidable thyroid surgery.
Original statement
تشخيص سرطان الغدة الدرقية تضاعف ثلاث مرات بين 1975 و2009، بينما ظلّت الوفيات ثابتة عند ~0.5، أي وباء تشخيصي لا وباء مرضي.
verbatim according to source. Translation by the project; the Arabic wording is authoritative.
Translation
Thyroid cancer diagnoses tripled (US 1975-2009) while mortality stayed flat — an epidemic of diagnosis (overdiagnosis), driving avoidable thyroid surgery.
Origin
- Source status
- Archive editors
- Attribution
- Archive editors (eltayebat.com); not necessarily Elawady's own words
- Origin
- https://eltayebat.com/rule/unnecessary-organ-removal/
- Attribution uncertainty
- Editorial summary/narrative and study selection written by the archive operators; the archive states that the cited research documents harm independently of Dr. Diaa's words.
- Claimed mechanism
Screening detects small papillary cancers that would not cause harm.
- Claimed health effect
Overtreatment.
- Population concerned
General population
- Geographic restriction by Elawady
not applicable
Scientific assessment
True – The statement is supported by robust evidence.
Certainty of evidence: high – Further research is very unlikely to change the assessment.
1. What was claimed?
Overdiagnosis epidemic in thyroid cancer.
2. What is demonstrably correct?
Incidence 4.9 -> 14.3 per 100,000 with mortality ~0.5 (A-ORG-19); in Korea screening correlated with incidence (r=0.77) but not mortality (I-ORG-02); USPSTF: net harm of screening asymptomatic adults (I-ORG-03).
3. What is wrong or exaggerated?
'Avoidable thyroidectomies' is an inference, not measured, but consistent with USPSTF's statement on overtreatment.
4. What remains unclear?
Which individual tumours are harmless.
5. Which studies support it?
6. Which studies contradict it?
None.
7. What applies to Germany and Europe?
Most cited cohorts are Scandinavian (Denmark, Sweden) and directly European; RCTs from the UK and Finland are directly transferable. Guidelines in Europe also emphasize defined indications (not verified here in detail).
8. What is known about Egypt?
No Egypt-specific data on rates or outcomes of tonsillectomy, cholecystectomy, hysterectomy, splenectomy or thyroid surgery were identified in this review.
9. What practical conclusion is appropriate?
Screening of people without symptoms is not recommended; thyroid nodules need proper evaluation rather than reflex surgery.
Assessment details
- Rationale for certainty of evidence
Consistent ecological data from the US and Korea, autopsy evidence (cited by authors), and a USPSTF recommendation against screening.
- Source quality
Correctly reported.
- Regional transferability
Overdiagnosis also reported in European countries (Vaccarella 2016; not abstracted, not used for numbers).
- Individual exceptions
Some thyroid cancers are aggressive and need surgery; the issue concerns screen-detected small papillary cancers.
- Regional scope of the claim
- general (biological/medical)
- Last reviewed
- 26 October 2026 provisional
Scientific evidence in detail
Scientifically well supported – The claim agrees with consistent, high-quality evidence.
Research question: Did US thyroid cancer incidence triple 1975-2009 while mortality stayed flat, indicating overdiagnosis that drives avoidable thyroid surgery?
Research question in detail (PECO)
- Population
- General population (US and worldwide)
- Intervention or exposure
- Thyroid imaging/screening intensity over time
- Comparison
- Earlier periods / countries with less screening
- Geographic scope
- universal; magnitude depends on national screening practice
- Outcomes
- Thyroid cancer incidence
- Thyroid cancer mortality
- Proportion overdiagnosed
Study results as reported by the authors. Our assessment follows below.
What speaks for the claim?
US thyroid cancer: more diagnoses, same deaths
Davies L et al.. JAMA Otolaryngol Head Neck Surg 2014 · PMID 24557566 · DOI 10.1001/jamaoto.2014.1 Ecological studyabstract checkedDavies 2014: US incidence 4.9 to 14.3 per 100,000; mortality stable around 0.5.
- Actual result
- RR 2.9 (2.7-3.1).
- Methodological quality
- moderate (registry)
- Relevance
- direct
- Limitations
- Ecological.
Thyroid cancer overdiagnosis in 63 countries
Li M et al.. Lancet Diabetes Endocrinol 2024 · PMID 39389067 · DOI 10.1016/S2213-8587(24)00223-7 Ecological studyabstract checkednewly addedLi 2024: 75.6% of thyroid cancers in 63 countries attributed to overdiagnosis.
- Actual result
- 1,736,133 of 2,297,057 cases.
- Methodological quality
- moderate (multi-country registry modelling)
- Relevance
- direct
- Limitations
- Model-based.
Korea: thyroid screening and cancer diagnoses
Ahn HS et al.. Thyroid 2016 · PMID 27627550 · DOI 10.1089/thy.2016.0075 Ecological studyabstract checkedSouth Korea: screening intensity strongly correlated with papillary cancer incidence, not mortality.
- Actual result
- r = 0.77 vs mortality r = -0.08.
- Methodological quality
- moderate (ecological)
- Relevance
- direct
- Limitations
- Ecological.
What speaks against the claim?
US thyroid cancer trends 1974-2013
Lim H et al.. JAMA 2017 · PMID 28362912 · DOI 10.1001/jama.2017.2719 Ecological studyabstract checkednewly addedLim 2017: incidence-based mortality rose slightly (1.1% per year), especially for advanced papillary cancer, indicating some true increase.
- Actual result
- Mortality 0.40 to 0.46 per 100,000.
- Methodological quality
- moderate (registry)
- Relevance
- direct
- Limitations
- Small absolute numbers.
What does the overall evidence say?
Editorial assessment based on the studies above – not itself a study result.
Which position is better supported?
Overdiagnosis explains most of the rise in thyroid cancer incidence; a small true increase in advanced cancers also exists.
Why some studies weigh more
Several independent registry analyses across countries agree; Lim 2017 qualifies rather than contradicts.
Is a causal relationship established? Probable Strong dose-response between screening intensity and incidence (Korea) without mortality change.
Remaining uncertainty
Share of true increase in some countries.
Justified conclusion
Correct; it does not imply that thyroid nodules or cancers never need treatment.
Why do studies seem to disagree?
Lim 2017 and Davies 2014 use different mortality measures (incidence-based vs overall) and periods; both agree that incidence tripled with very small mortality change.
Does this depend on the country?
- General biological effects
- Universal phenomenon tied to imaging use.
- Eating habits
- Not relevant to this claim.
- Origin of the food
- Not applicable.
- Contaminants
- Not applicable.
- National production conditions
- Not applicable.
- Legal rules
- Not applicable.
- Actual monitoring data
- Egypt not reported in the abstracts read; overdiagnosis is expanding in transitioning countries (Li 2024).
A regional difference that changes the conclusion is not supported by robust data.
Statistical re-check
- Incidence and mortality ratios – Incidence x3.16; mortality +15% relative (+0.06/100,000 absolute) recalculated
- Overdiagnosis proportion – 75.6% reproduced recalculated
Certainty of the overall evidence (GRADE, simplified)
- Main outcome
- Overdiagnosis share of thyroid cancer incidence
- Starting level
- low (observational studies)
- Reasons for upgrading
- large effect
- dose-response (screening intensity)
- consistency across countries
- Result
- high
Simplified assessment by a single reviewer, following the GRADE approach; not a formal GRADE panel. GRADE rates the body of evidence for one outcome, not individual studies.
Clinical guidelines and official statements checked
- USPSTF: Screening for Thyroid Cancer: Recommendation Statement (2017) · Original publication
Recommends against screening asymptomatic adults for thyroid cancer (registered as I-ORG-03). - American Thyroid Association: 2015 ATA Management Guidelines for Adult Patients with Thyroid Nodules and Differentiated Thyroid Cancer (2015/2016) · Original publication
Most asymptomatic benign nodules with modest growth should be followed without intervention (strong); surgery may be considered for growing benign nodules > 4 cm or with compressive symptoms; total/near-total thyroidectomy for cancers > 4 cm, extrathyroidal extension or metastases (I-ORG-114).
Search strategy
Documented literature searches for this review (search strings in the original database syntax).
| Database | Date | Search | Looking for | Hits | Included |
|---|---|---|---|---|---|
| PubMed | 26 October 2026 | (thyroid cancer[ti]) AND (incidence[ti]) AND (mortality[ti]) AND (trends[ti]) AND (United States OR worldwide OR global) AND 2016:2026[dp] | both directions | 13 | |
| Europe PMC | 26 October 2026 | (TITLE:"thyroid cancer") AND (TITLE:overdiagnosis) AND (TITLE:worldwide OR TITLE:global OR TITLE:countries) | supporting evidence | 6 | |
| PubMed | 26 October 2026 | (thyroid cancer[ti]) AND overdiagnosis[ti] AND (Egypt OR Arab OR Middle East OR Saudi) | both directions | 1 | |
| PubMed | 26 October 2026 | (thyroid nodule*[ti] OR papillary microcarcinoma[ti]) AND (active surveillance[ti]) | both directions | 38 | |
| PubMed | 26 October 2026 | American Thyroid Association management guidelines thyroid nodules differentiated thyroid cancer[ti] | guidelines | 38 |
Open questions
Egypt-specific thyroid cancer incidence/mortality trends.
How deeply was this checked?
6 linked studies: 0 checked in full text (0 of them with a structured risk-of-bias assessment), 5 on the basis of the abstract, 1 bibliographically only. No formal assessment with two independent reviewers and no independent human expert review has taken place yet.
Last scientific review: 26 October 2026
History of the verdict
- 25 October 2026 · Phase 1 · Initial assessment: True (high)
- 26 October 2026 · Phase 4 (systematic evidence review) · Re-examined with extended evidence; verdict unchanged: True (high)
Unchanged (“True”, high). Lim 2017 adds a nuance (small true increase in advanced disease) without changing the conclusion.
New sources: I-ORG-113 I-ORG-112
In plain language
The archive says that the large rise in thyroid cancer diagnoses is mainly due to finding small, harmless cancers. This is correct and widely accepted. In the US diagnoses nearly tripled while deaths did not change; in South Korea, regions that screened more found more cancers without any change in deaths. Experts recommend not screening healthy people without symptoms.
Studies on this claim
Studies supporting the claim (4)
-
US thyroid cancer: more diagnoses, same deaths
Davies L et al.. JAMA Otolaryngol Head Neck Surg 2014 · PMID 24557566 · DOI 10.1001/jamaoto.2014.1Ecological studycited by the Tayebat archiveabstract checked★ key studyDiagnoses nearly tripled from 1975 to 2009 while deaths stayed at about 0.5 per 100,000.
Does the study support the specific claim? Yes · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Overdiagnosis
- How was the study done?
Trend analysis
- How many people, animals or samples were studied?
SEER 9
- What was actually found?
Incidence up, mortality flat
- How large was the observed effect?
RR 2.9
- What do the results mean in everyday life?
Many small cancers found would never have caused harm
- What are the study's limitations?
Ecological
- What does it say about Elawady's specific claim?
Supports
- Do the results apply to Germany and Europe?
Similar in Europe (not verified here)
- What can explicitly not be concluded from this study?
Which individual tumours are harmless
-
Korea: thyroid screening and cancer diagnoses
Ahn HS et al.. Thyroid 2016 · PMID 27627550 · DOI 10.1089/thy.2016.0075Ecological studyindependent cross-checkabstract checked★ key studyRegions that screened more found far more small papillary cancers, without any effect on thyroid cancer deaths.
Does the study support the specific claim? Yes · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Screening effect
- How was the study done?
Ecological
- How many people, animals or samples were studied?
16 regions
- What was actually found?
Screening drives incidence
- How large was the observed effect?
r=0.77
- What do the results mean in everyday life?
Screening healthy people finds harmless cancers
- What are the study's limitations?
Ecological
- What does it say about Elawady's specific claim?
Supports overdiagnosis claim
- Do the results apply to Germany and Europe?
Less screening in Europe
- What can explicitly not be concluded from this study?
Individual harm
-
US task force: do not screen healthy adults for thyroid cancer
US Preventive Services Task Force. JAMA 2017 · PMID 28492905 · DOI 10.1001/jama.2017.4011Guideline / position statementindependent cross-checkabstract checkedScreening does more harm than good because it finds many harmless cancers.
Does the study support the specific claim? Yes · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Screening policy
- How was the study done?
Guideline
- How many people, animals or samples were studied?
n/a
- What was actually found?
Net harm
- How large was the observed effect?
D recommendation
- What do the results mean in everyday life?
Avoid screening without symptoms
- What are the study's limitations?
Indirect evidence
- What does it say about Elawady's specific claim?
Supports overdiagnosis claim
- Do the results apply to Germany and Europe?
Applicable
- What can explicitly not be concluded from this study?
Management of symptomatic nodules
-
Thyroid cancer overdiagnosis in 63 countries
Li M et al.. Lancet Diabetes Endocrinol 2024 · PMID 39389067 · DOI 10.1016/S2213-8587(24)00223-7Ecological studyindependent cross-checkabstract checked★ key studyAbout three in four thyroid cancer diagnoses worldwide were estimated to be overdiagnosis, while deaths stayed low.
About three quarters of thyroid cancer diagnoses worldwide are estimated to be overdiagnosed.
Does the study support the specific claim? Yes · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Estimate thyroid cancer overdiagnosis worldwide
- How was the study done?
Analysis of cancer registries and mortality data
- How many people, animals or samples were studied?
63 countries, 2.3 million cases
- What was actually found?
75.6% of cases attributed to overdiagnosis
- How large was the observed effect?
n/a
- What do the results mean in everyday life?
Many small thyroid cancers would never cause harm
- What are the study's limitations?
Model-based
- What does it say about Elawady's specific claim?
Supports the claim
- Do the results apply to Germany and Europe?
Applies to Europe
- What can explicitly not be concluded from this study?
Cannot tell which individual cancer is harmless
No study in this group is marked as key.
Studies contradicting or limiting the claim (1)
-
US thyroid cancer trends 1974-2013
Lim H et al.. JAMA 2017 · PMID 28362912 · DOI 10.1001/jama.2017.2719Ecological studyindependent cross-checkabstract checked★ key studyThyroid cancer diagnoses tripled; deaths rose only slightly, mainly from advanced cancers.
Mortality did not stay completely flat; a small true increase in advanced cancers exists alongside overdiagnosis.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Check whether rising thyroid cancer diagnoses reflect a real increase
- How was the study done?
US cancer registry analysis
- How many people, animals or samples were studied?
77,276 patients
- What was actually found?
Incidence tripled; small rise in mortality for advanced disease
- How large was the observed effect?
Mortality +1.1% per year
- What do the results mean in everyday life?
Most new cases are small, but some real increase exists
- What are the study's limitations?
Registry data only
- What does it say about Elawady's specific claim?
Mostly supports overdiagnosis, with a caveat
- Do the results apply to Germany and Europe?
Similar patterns in Europe
- What can explicitly not be concluded from this study?
Cannot say which individual cancers need surgery
No study in this group is marked as key.
Studies with mixed or unclear results (1)
-
Korea's thyroid cancer 'epidemic'
Ahn HS, Kim HJ, Welch HG. N Engl J Med 2014 · PMID 25372084 · DOI 10.1056/NEJMp1409841Otherindependent cross-checkbibliographically verifiedTitle indicates screening-driven overdiagnosis; content not verified here.
Does the study support the specific claim? Unclear · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Overdiagnosis
- How was the study done?
Perspective
- How many people, animals or samples were studied?
n/a
- What was actually found?
Not extracted
- How large was the observed effect?
n/a
- What do the results mean in everyday life?
n/a
- What are the study's limitations?
Not accessed
- What does it say about Elawady's specific claim?
See I-ORG-02
- Do the results apply to Germany and Europe?
n/a
- What can explicitly not be concluded from this study?
Any numeric statement
No study in this group is marked as key.
Regional context
Germany / EU
Most cited cohorts are Scandinavian (Denmark, Sweden) and directly European; RCTs from the UK and Finland are directly transferable. Guidelines in Europe also emphasize defined indications (not verified here in detail).
Egypt
No Egypt-specific data on rates or outcomes of tonsillectomy, cholecystectomy, hysterectomy, splenectomy or thyroid surgery were identified in this review.
What applies in my country?
General scientific assessment
True Correct: thyroid cancer overdiagnosis is well documented.
This statement concerns biological or medical relationships. The scientific assessment above applies regardless of the country; country-specific food data do not change it.
References
- Current thyroid cancer trends in the United States.. Davies L et al.. JAMA Otolaryngol Head Neck Surg 2014 · PMID 24557566 · DOI 10.1001/jamaoto.2014.1
- Thyroid Cancer Screening in South Korea Increases Detection of Papillary Cancers with No Impact on Other Subtypes or Thyroid Cancer Mortality.. Ahn HS et al.. Thyroid 2016 · PMID 27627550 · DOI 10.1089/thy.2016.0075
- Screening for Thyroid Cancer: US Preventive Services Task Force Recommendation Statement.. US Preventive Services Task Force. JAMA 2017 · PMID 28492905 · DOI 10.1001/jama.2017.4011
- Evolving epidemiological patterns of thyroid cancer and estimates of overdiagnosis in 2013-17 in 63 countries worldwide: a population-based study.. Li M et al.. Lancet Diabetes Endocrinol 2024 · PMID 39389067 · DOI 10.1016/S2213-8587(24)00223-7
- Trends in Thyroid Cancer Incidence and Mortality in the United States, 1974-2013.. Lim H et al.. JAMA 2017 · PMID 28362912 · DOI 10.1001/jama.2017.2719
- Korea's thyroid-cancer "epidemic"--screening and overdiagnosis.. Ahn HS, Kim HJ, Welch HG. N Engl J Med 2014 · PMID 25372084 · DOI 10.1056/NEJMp1409841