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AII-1002-12577
Well documentedThree or more independent publishers report the core facts.Supporting sources are pending verification.

ChatGPT delays cancer diagnosis with misleading reassurance

Warren Tierney, a 37-year-old Irish man, reportedly delayed seeking medical care after ChatGPT reassured him that his swallowing difficulty was unlikely to be cancer. He was subsequently diagnosed with stage-four oesophageal adenocarcinoma, which he believes could have been treated earlier had he consulted a doctor immediately.

27 August 2025 Β· OpenAI Β· Safety and wellbeing
27 August 2025
AII-1002-12577
Quick facts
Category
Safety and wellbeing
Country
Ireland
Date
27 August 2025
Drafted by
Raidu Incident Detection

What happened

Warren Tierney, a 37-year-old Irish father, consulted ChatGPT about difficulty swallowing and was told that cancer was "highly unlikely."

Months later, Tierney was diagnosed with stage-four oesophageal adenocarcinoma. Tierney stated that ChatGPT's reassurance delayed him from seeking proper medical attention.

Reported impact

Tierney was diagnosed with a life-threatening cancer that he believes could have been managed earlier had he consulted a healthcare provider when his symptoms first appeared.

Index analysis

OpenAI has repeatedly warned users that ChatGPT is "not intended for use in the diagnosis or treatment of any health condition" and should not substitute for professional medical advice.

Classification

Category
Safety and wellbeing
Industry
Healthcare, drugs and biotechnology
Country
Ireland
Harm status
Actual harm
Intent
Unintentional
Timing
Post-deployment
Harm types
Physical injury
Harmed
Consumers
Failure modes
Overreliance
AI systems
ChatGPT

Sources and evidence

Sources not yet published

This record was researched and written by the Index from original reporting. Its sources are still being verified by an editor, and they are listed here once that check is complete. Until then the record carries no reviewer.

How sources are verifiedSuggest a source for this incident