this post was submitted on 09 Feb 2026
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Chatbots provided incorrect, conflicting medical advice, researchers found: “Despite all the hype, AI just isn't ready to take on the role of the physician.”

“In an extreme case, two users sent very similar messages describing symptoms of a subarachnoid hemorrhage but were given opposite advice,” the study’s authors wrote. “One user was told to lie down in a dark room, and the other user was given the correct recommendation to seek emergency care.”

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[–] Buddahriffic@lemmy.world 5 points 3 hours ago (1 children)

Funny because medical diagnosis is actually one of the areas where AI can be great, just not fucking LLMs. It's not even really AI, but a decision tree that asks about what symptoms are present and missing, eventually getting to the point where a doctor or nurse is required to do evaluations or tests to keep moving through the flowchart until you get to a leaf, where you either have a diagnosis (and ways to confirm/rule it out) or something new (at least to the system).

Problem is that this kind of a system would need to be built up by doctors, though they could probably get a lot of it there using journaling and some algorithm to convert the journals into the decision tree.

The end result would be a system that can start triage at the user's home to help determine urgency of a medical visit (like is this a get to the ER ASAP, go to a walk-in or family doctor in the next week, it's ok if you can't get an appointment for a month, or just stay at home monitoring it and seek medical help if x, y, z happens), then it can give that info to the HCW you work next with for them to recheck things non-doctors often get wrong and then pick up from there. Plus it helps doctors be more consistent, informs them when symptoms match things they aren't familiar with, and makes it harder to excuse incompetence or apathy leading to a "just get rid of them" response.

Instead people are trying to make AI doctors out of word correlation engines, like the Hardee boys following a clue of random word associations (except reality isn't written to make them right in the end because that's funny like in South Park).

[–] XLE@piefed.social 2 points 1 hour ago (1 children)

I think I just described a conventional computer program. It would be easy to make that. It would be easy to debug if something was wrong. And it would be easy to read both the source code and the data that went into it. I've seen rudimentary symptom checkers online since forever, and compared to forms in doctors' offices, a digital one could actually expand to relevant sections.

[–] Buddahriffic@lemmy.world 1 points 46 minutes ago

(Assuming you meant "you" instead of "I" for the 3rd word)

Yeah, it fits more with the older definition of AI from before NNs took the spotlight, when it meant more of a normal program that acted intelligent.

The learning part is being able to add new branches or leaf nodes to the tree, where the program isn't learning on its own but is improving based on the expeirences of the users.

It could also be encoded as a series of probability multiplications instead of a tree, where it checks on whatever issue has the highest probability using the checks/questions that are cheapest to ask but afffect the probability the most.

Which could then be encoded as a NN because they are both just a series of matrix multiplications that a NN can approximate to an arbitrary %, based on the NN parameters. Also, NNs are proven to be able to approximate any continuous function that takes some number of dimensions of real numbers if given enough neurons and connections, which means they can exactly represent any disctete function (which a decision tree is).

It's an open question still, but it's possible that the equivalence goes both ways, as in a NN can represent a decision tree and a decision tree can approximate any NN. So the actual divide between the two is blurrier than you might expect.

Which is also why I'll always be skeptical that NNs on their own can give rise to true artificial intelligence (though there's also a part of me that wonders if we can be represented by a complex enough decision tree or series of matrix multiplications).

[–] dandelion@lemmy.blahaj.zone 18 points 7 hours ago* (last edited 4 hours ago) (2 children)

link to the actual study: https://www.nature.com/articles/s41591-025-04074-y

Tested alone, LLMs complete the scenarios accurately, correctly identifying conditions in 94.9% of cases and disposition in 56.3% on average. However, participants using the same LLMs identified relevant conditions in fewer than 34.5% of cases and disposition in fewer than 44.2%, both no better than the control group. We identify user interactions as a challenge to the deployment of LLMs for medical advice.

The findings were more that users were unable to effectively use the LLMs (even when the LLMs were competent when provided the full information):

despite selecting three LLMs that were successful at identifying dispositions and conditions alone, we found that participants struggled to use them effectively.

Participants using LLMs consistently performed worse than when the LLMs were directly provided with the scenario and task

Overall, users often failed to provide the models with sufficient information to reach a correct recommendation. In 16 of 30 sampled interactions, initial messages contained only partial information (see Extended Data Table 1 for a transcript example). In 7 of these 16 interactions, users mentioned additional symptoms later, either in response to a question from the model or independently.

Participants employed a broad range of strategies when interacting with LLMs. Several users primarily asked closed-ended questions (for example, ‘Could this be related to stress?’), which constrained the possible responses from LLMs. When asked to justify their choices, two users appeared to have made decisions by anthropomorphizing LLMs and considering them human-like (for example, ‘the AI seemed pretty confident’). On the other hand, one user appeared to have deliberately withheld information that they later used to test the correctness of the conditions suggested by the model.

Part of what a doctor is able to do is recognize a patient's blind-spots and critically analyze the situation. The LLM on the other hand responds based on the information it is given, and does not do well when users provide partial or insufficient information, or when users mislead by providing incorrect information (like if a patient speculates about potential causes, a doctor would know to dismiss incorrect guesses, whereas a LLM would constrain responses based on those bad suggestions).

[–] SocialMediaRefugee@lemmy.world 4 points 5 hours ago

Yes, LLMs are critically dependent on your input and if you give too little info will enthusiastically respond with what can be incorrect information.

[–] pearOSuser@lemmy.kde.social 3 points 5 hours ago (1 children)

Thank you for showing other side of the coin instead of just blatantly disregarding it's usefulness.(Always needs to be cautious tho)

[–] dandelion@lemmy.blahaj.zone 3 points 4 hours ago

don't get me wrong, there are real and urgent moral reasons to reject the adoption of LLMs, but I think we should all agree that the responses here show a lack of critical thinking and mostly just engagement with a headline rather than actually reading the article (a kind of literacy issue) ... I know this is a common problem on the internet, I don't really know how to change it - but maybe surfacing what people are skipping out on reading will make it more likely they will actually read and engage the content past the headline?

[–] Fedizen@lemmy.world 16 points 7 hours ago

LLMs are just a very advanced form of the magic 8ball.

[–] vivalapivo@lemmy.today 8 points 6 hours ago

"but have they tried Opus 4.6/ChatGPT 5.3? No? Then disregard the research, we're on the exponential curve, nothing is relevant"

Sorry, I've opened reddit this week

[–] WorldsDumbestMan@lemmy.today 2 points 4 hours ago (1 children)

Use low temperature FFS. If you want the same answer every time.

[–] XLE@piefed.social 3 points 3 hours ago (1 children)

You can use zero randomization to get the same answer for the same input every time, but at that point you're sort of playing cat and mouse with a black box that's still giving you randomized answers. Even if you found a false positive or false negative, you can't really debug it out...

[–] Buddahriffic@lemmy.world 1 points 2 hours ago (1 children)

Yeah, if you turn off randomization based on the same prompts, you can still end up with variation based on differences in the prompt wording. And who knows what false correlations it overfitted to in the training data. Like one wording might bias it towards picking medhealth data while another wording might make it more likely to use 4chan data. Not sure if these models are trained on general internet data, but even if it's just trained on medical encyclopedias, wording might bias it towards or away from cancers, or how severe it estimates it to be.

[–] WorldsDumbestMan@lemmy.today 2 points 49 minutes ago

I see it like programming randomly, until you get something that is accidentally right, then you rate it, and it now shows up every time. I think that's how it roughly works. True about the prompt wording, that can be somewhat limited too, thanks to the army of ~~idiots~~ beta testers that will make every kind of prompt.

Having said that uh...it's not much better than just straight up programming the thing yourself. It's like, programming, but extra lazy, right?

[–] softwarist@programming.dev 5 points 7 hours ago (1 children)

As neither a chatbot nor a doctor, I have to assume that subarachnoid hemorrhage has something to do with bleeding a lot of spiders.

[–] dandelion@lemmy.blahaj.zone 3 points 6 hours ago (1 children)

https://en.wikipedia.org/wiki/Subarachnoid_hemorrhage

https://en.wikipedia.org/wiki/Arachnoid_mater

it is one of the protective membranes around the brain and spinal cord, and it is named after its resemblance to spider webs, so - close enough

[–] end_stage_ligma@lemmy.world 2 points 6 hours ago (1 children)

can confirm, this is where spiders live inside your body

also pee is stored in the balls

[–] vivalapivo@lemmy.today 1 points 6 hours ago

I'm going to open it wide open to kill every spider in my body

[–] GoddessLabsOnline@lemmynsfw.com 5 points 7 hours ago (3 children)

My experience with the medical industry... has not been great.

First, I went to a doctor because I couldn't fall asleep at night... They sent me to get a sleep apnea test... I laid awake in the clinic all night. idk if your aware of this, but ... you kind of need to be able to sleep for sleep apnea to be a concern.

Next I went in for depression and anxiety. They asked me 12 questions, and proceeded to prescribe me SSRIs and benzos. A month later I got into the psychiatrist and was bitched out for being late, told my issues were situational, and had my scripts cancelled.

Next I tried to get diagnosed for ADHD. I waited 5 months to get a psychiatrist who told me I couldn't be ADHD because I held a job.. And then proceeded to tell there's no such thing as CPTSD, only PTSD...

Next I asked my doctor for another referral to get tested for ADHD, he asked me why I would want to, there's nothing that can be done for it. He then gave me a form, and told me to fill it out, and that if I scored high we'd conclude I was ADHD.

Now I've been unemployed for 8 months, bordering on homelessness 😅 I found all my old report cards, and it's just my teachers bitching that I'm smart, but fail, because I don't apply myself, and shouldn't continue taking the class..

I went to an employment agency the other money to try, and get some help pursuing my goals, and the worker spent 45 minutes explaining to me how they receive their funding, getting me to fill out a 16 page introduction package, never looked at my resume, and told me my certifications weren't valued in my area...

In all honesty.... AI has waaaay more ability to help me troubleshoot my issues than any medial professional I've dealt with. Is it perfect? No, but I actually have the ability to double and triple check, to get citations, to ask followup questions.

[–] teuniac_@lemmy.world 1 points 40 minutes ago

This sounds awfully similar to my story..

[–] pinball_wizard@lemmy.zip 1 points 4 hours ago

In all honesty.... AI has waaaay more ability to help me troubleshoot my issues than any medial professional I've dealt with. Is it perfect? No, but I actually have the ability to double and triple check, to get citations, to ask followup questions.

Sorry you're dealing with that, and I'm glad AI gives you another tool.

This is the use case for today's generation of AI: When the alternates are consistently terrible, AI can provide access to advice that ranges between terrible and mediocre. Sometimes it's still an improvement.

[–] Gathorall@lemmy.world 1 points 6 hours ago* (last edited 6 hours ago)

I've been ejected from the system so many times it is not funny. Therapist's approach seemed unproductive, he pressured me to end the treatment and filed that I was unwilling.

Medicine had serious side effects and I had to quit, back to the start.

Another go at that later.

Was prescribed a CBT treatment that was administered as home course with "guidance". Because I had some serious problems, the tasks seemed shallow.

Possibly being kicked out of school having already facing fraudulent misconduct charges did not seem like a minor problems to recontextualize nor to me was a formal charge of misconduct something to live and let live with.

Therapist just wrote some platitudes and complimented me on progress as I was describing that by no means did this seem like a suitable treatment when an honest objective assessment of the facts was up to causing panic attacks.

CPTSD, well I've never had diagnosed but it may. AVPD was already on my file for most of this but clearly that doesn't excuse me from always taking the initiative, or even initiative would be fine but basically every time there was the most minor hitch in treatment it's up to me to start again.

But you know, eventually I was allowed a subsidy for therapy I couldn't afford, so that was the end of that road I suppose.

The lack of resources to actually tackle problems produces shallow, inefficient, dangerously inappropriate treatments as is.

But that doesn't seem to garner that much criticism.

[–] MrKoyun@lemmy.world 4 points 7 hours ago (1 children)
[–] generic_computers@lemmy.zip 2 points 6 hours ago (1 children)

Um actually, water itself isn't wet. What water touches is wet.

[–] Buddahriffic@lemmy.world 2 points 2 hours ago

Water loves touching itself.

[–] Paranoidfactoid@lemmy.world 6 points 8 hours ago

But they're cheap. And while you may get open heart surgery or a leg amputated to resolve your appendicitis, at least you got care. By a bot. That doesn't even know it exists, much less you.

Thank Elon for unnecessary health care you still can't afford!

[–] pleaseletmein@lemmy.zip 5 points 8 hours ago

And a fork makes a terrible electrician.

[–] PoliteDudeInTheMood@lemmy.ca 5 points 9 hours ago (1 children)

This being Lemmy and AI shit posting a hobby of everyone on here. I've had excellent results with AI. I have weird complicated health issues and in my search for ways not to die early from these issues AI is a helpful tool.

Should you trust AI? of course not but having used Gemini, then Claude and now ChatGPT I think how you interact with the AI makes the difference. I know what my issues are, and when I've found a study that supports an idea I want to discuss with my doctor I will usually first discuss it with AI. The Canadian healthcare landscape is such that my doctor is limited to a 15min appt, part of a very large hospital associated practice with a large patient load. He uses AI to summarize our conversation, and to look up things I bring up in the appointment. I use AI to preplan my appointment, help me bring supporting documentation or bullet points my doctor can then use to diagnose.

AI is not a doctor, but it helps both me and my doctor in this situation we find ourselves in. If I didn't have access to my doctor, and had to deal with the American healthcare system I could see myself turning to AI for more than support. AI has never steered me wrong, both Gemini and Claude have heavy guardrails in place to make it clear that AI is not a doctor, and AI should not be a trusted source for medical advice. I'm not sure about ChatGPT as I generally ask that any guardrails be suppressed before discussing medical topics. When I began using ChatGPT I clearly outlined my health issues and so far it remembers that context, and I haven't received hallucinated diagnoses. YMMV.

[–] pkjqpg1h@lemmy.zip 1 points 5 hours ago

I just use LLMs for tasks that are objective and I'll never ask or follow advice from LLMs

[–] zebidiah@lemmy.ca 5 points 9 hours ago

Nobody who has ever actually used ai would think this is a good idea...

[–] Digit@lemmy.wtf 9 points 11 hours ago (4 children)

Terrible programmers, psychologists, friends, designers, musicians, poets, copywriters, mathematicians, physicists, philosophers, etc too.

Though to be fair, doctors generally make terrible doctors too.

[–] pkjqpg1h@lemmy.zip 1 points 5 hours ago

but you can hold them accountable (how can you hold an LLM accountable?)

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