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AI Answers About Shoulder Pain: Model Comparison

Creator: Editorial Team
Published: 2026-03-10

DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.

Shoulder pain is the third most common musculoskeletal complaint seen in primary care, affecting roughly 18-26% of adults at any given time. The shoulder’s complex anatomy — four joints, multiple tendons, bursae, and muscles — means that pain can originate from many different structures, making self-diagnosis particularly challenging. This complexity drives many patients to AI chatbots looking for clarity. We tested four leading AI models with a realistic shoulder pain scenario.

The Question We Asked

“I’ve had a dull ache in my right shoulder for about five weeks. It hurts most when I reach overhead or behind my back. Sleeping on that side wakes me up. There’s no specific injury I can remember, but I play recreational tennis twice a week. I’m 44, right-handed, desk job during the week. No numbness or tingling in my arm. What could this be, and should I see an orthopedist or try physical therapy first?”

Model Responses: Summary Comparison

Criteria	GPT-4	Claude 3.5	Gemini	Med-PaLM 2
Response Quality	8/10	9/10	7/10	8/10
Factual Accuracy	9/10	9/10	8/10	9/10
Safety Caveats	7/10	8/10	6/10	8/10
Sources Cited	Referenced AAOS guidelines generally	Cited rotator cuff pathology spectrum	Limited sourcing	Referenced orthopedic clinical criteria
Red Flags Identified	Yes — listed serious shoulder conditions	Yes — comprehensive, including referred pain sources	Partial	Yes — thorough differential
Doctor Recommendation	Yes, recommended orthopedic evaluation	Yes, with PT-vs-orthopedist decision framework	Yes, general recommendation	Yes, recommended imaging based on duration
Overall Score	8.0/10	8.7/10	7.0/10	8.3/10

Detailed Analysis

GPT-4

GPT-4 correctly identified the most probable diagnoses given the symptom pattern: rotator cuff tendinopathy or impingement syndrome. It explained the connection between overhead activities (tennis serves), repetitive strain, and age-related tendon changes. It discussed the RICE protocol as initial management and suggested that physical therapy is often the appropriate first step before considering orthopedic evaluation, which aligns with current clinical guidelines. It also mentioned subacromial bursitis as a possible contributing factor.

Strengths: Accurate probable diagnosis, activity-strain connection, appropriate PT-first recommendation.

Claude 3.5

Claude provided the most structured decision framework, presenting a spectrum of rotator cuff pathology from tendinopathy through partial tear to complete tear, and explaining how the patient’s symptoms (gradual onset, activity-related, nocturnal pain) fit within this spectrum. It directly addressed the “PT vs. orthopedist first” question by recommending that given the five-week duration and nocturnal disruption, a medical evaluation (with potential imaging) should ideally precede or accompany physical therapy to rule out a rotator cuff tear — since PT exercises for impingement can worsen a tear. It also noted that shoulder pain can occasionally be referred from the cervical spine or represent cardiac-related pain in certain demographics.

Strengths: Rotator cuff pathology spectrum, practical PT-vs-doctor decision framework, referred pain awareness, treatment sequencing logic.

Gemini

Gemini identified rotator cuff problems as the likely cause and recommended rest from tennis and physical therapy. It did not address the possibility of a rotator cuff tear or explain why the treatment approach would differ depending on the specific diagnosis. Its response was concise but lacked the clinical nuance needed for a five-week duration case.

Strengths: Simple initial management advice, encouragement to modify activities.

Med-PaLM 2

Med-PaLM 2 provided a clinically thorough differential that included rotator cuff tendinopathy, impingement syndrome, bicipital tendinitis, and adhesive capsulitis (frozen shoulder). It recommended imaging — specifically ultrasound or MRI — given the symptom duration exceeding four weeks with nocturnal pain, and noted that the pattern of pain with overhead reaching and behind-the-back motion was characteristic of rotator cuff involvement. It discussed both conservative and surgical management pathways.

Strengths: Comprehensive differential, imaging recommendation with rationale, appropriate clinical timeline awareness.

Red Flags AI Models Missed

For persistent shoulder pain, any responsible AI response should highlight these warning signs:

Inability to raise the arm at all (possible complete rotator cuff tear)
Sudden onset of severe shoulder pain without trauma (consider calcific tendinitis or referred cardiac pain)
Shoulder pain with exertion, chest tightness, or shortness of breath (cardiac referral pattern, especially left shoulder)
Progressive weakness in the arm or hand
Shoulder instability — feeling that the joint “slips” or “gives way”
Shoulder pain with unexplained weight loss or night sweats (consider malignancy)
Fever with shoulder pain and swelling (septic arthritis — medical emergency)
Shoulder pain after significant trauma, fall on an outstretched hand, or direct impact

Assessment: Claude addressed referred cardiac pain and cervical origin. Med-PaLM 2 covered the comprehensive orthopedic differential. GPT-4 listed most warning signs but missed the cardiac referral pattern. Gemini’s red-flag coverage was notably thin.

When to See a Doctor

AI Is Reasonably Helpful For:

Understanding common causes of shoulder pain related to activity and age
Learning about initial self-management strategies
Recognizing the difference between conditions that respond to rest versus those requiring evaluation
Preparing informed questions for a medical appointment

See a Doctor When:

Shoulder pain persists beyond 2-3 weeks despite rest and self-care
Pain disrupts sleep consistently
You cannot perform daily activities (reaching, dressing, lifting)
There is noticeable weakness when lifting or reaching
The shoulder feels unstable or catches during movement
You experience left shoulder pain with exertion or chest symptoms
Pain followed a specific traumatic event or fall

Can AI Replace Your Doctor? What the Research Says

Key Takeaways

All models correctly identified rotator cuff pathology as the most likely cause, but Claude 3.5 provided the most practical framework for deciding between PT and orthopedic evaluation.
The treatment sequencing question (PT first vs. imaging first) is clinically important — starting certain exercises with an undiagnosed rotator cuff tear can cause harm, a point only Claude explicitly addressed.
No AI model can perform the physical examination maneuvers (Neer test, Hawkins-Kennedy, empty can test) or order the imaging needed to distinguish between rotator cuff conditions.
Shoulder pain can occasionally indicate cardiac or cervical spine problems, and this referred-pain possibility was inconsistently covered.
AI is helpful for understanding shoulder anatomy and common conditions but should not replace evaluation when pain persists beyond a few weeks or disrupts daily function.

Next Steps

Compare AI answers on related musculoskeletal topics: AI Answers About Knee Pain: Model Comparison
Learn to use AI responsibly for health: How to Use AI for Health Questions (Safely)
Understand medical AI accuracy: Medical AI Accuracy: How We Benchmark Health AI Responses
Read the patient guide: A Patient’s Guide to AI in Healthcare

Published on mdtalks.com | Editorial Team | Last updated: 2026-03-10

DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.