Harrison's Principles of Internal Medicine, 22nd Edition (2025)
Ultimate Clinical Challenge Exam Bank
3,600+ Original Clinical Challenges • Updated 2026–2027
QUICK NAVIGATION GUIDE
PART CONTENT COVERAGE CLINICAL CHALLENGES
I The Profession of Medicine 1–100
II Cardinal Manifestations & Presentation of Diseases 101–800
III Pharmacology 801–920
IV Oncology & Hematology 921–1200
V Infectious Diseases 1201–2030
VI Cardiovascular Medicine 2031–2280
VII Respiratory Medicine 2281–2420
VIII Critical Care Medicine 2421–2500
IX Kidney Disease 2501–2610
X Gastroenterology 2611–2860
XI Rheumatology 2861–3270
XII Endocrinology & Metabolism 3271–3420
XIII Neurology 3421–3570
XIV Psychiatry 3571–3640
XV Dermatology 3641–3710
XVI Eye Disorders 3711–3760
XVII Geriatric Medicine 3761–3810
XVIII Women's Health 3811–3860
XIX Global Medicine 3861–3910
,PART CONTENT COVERAGE CLINICAL CHALLENGES
XX Environmental, Occupational & Travel Medicine 3911–3960
XXI Genetics 3961–4060
XXII Autoimmunity & Autoimmune Disease 4061–4160
EXAM BANK STRUCTURE
Each chapter has been developed using a standardized, board-style learning format to maximize clinical
understanding and examination performance.
Section Purpose
Learning Objectives Defines the major competencies and concepts assessed in each chapter.
Progressive case-based clinical scenarios designed to develop diagnostic
Clinical Challenges
reasoning and clinical decision-making skills.
Best Answer Evidence-based correct response with direct clinical relevance.
Key Clinical Insight Concise explanation highlighting the core medical principle being tested.
Why the Other Options Are Less Explains why alternative choices are incorrect while reinforcing important
Appropriate differential diagnoses.
Practical bedside knowledge commonly tested in examinations and applied
Clinical Pearl
in clinical practice.
Rapid review summary emphasizing the highest-yield facts from each Clinical
Harrison's High-Yield Point
Challenge.
SPECIAL FEATURES
✔ Comprehensive coverage of all Harrison's Parts
✔ Progressive Clinical Challenge numbering
✔ Chapter-by-chapter organization
✔ Original integrated clinical scenarios
✔ Advanced board-style multiple-choice questions
✔ Evidence-based explanations
,✔ Detailed clinical reasoning
✔ High-Yield Clinical Pearls
✔ Harrison's High-Yield Points
✔ Learning Objectives preceding every chapter
✔ Comprehensive differential diagnosis approach
✔ Updated according to Harrison's Principles of Internal Medicine, 22nd Edition (2025/26/27)
Harrison's Principles of Internal Medicine, 22nd Edition updated 2026-2027
Ultimate Clinical Challenge Exam Bank
PART I — The Profession of Medicine
Chapter 1 — The Practice of Internal Medicine
Clinical Challenge 1
Learning Objective: Understand the role of the internist in comprehensive adult patient care.
A 68-year-old retired accountant attends the internal medicine clinic for increasing fatigue, exertional dyspnea,
and bilateral knee pain over the past four months. His medical history includes hypertension, type 2 diabetes
mellitus, stage 3 chronic kidney disease, hyperlipidemia, and obesity. During the consultation, he also reports
poor sleep, occasional forgetfulness, urinary frequency, and concerns about taking more than ten daily
medications prescribed by different specialists. Rather than addressing only his chief complaint, the internist
,reviews his chronic illnesses, medications, vaccination status, cardiovascular risk, renal function, functional
capacity, and psychosocial concerns before developing a unified long-term management plan.
Which of the following BEST describes the primary role of the internist in this clinical encounter?
A. Focus primarily on treating the patient's presenting symptom while referring all chronic illnesses to
individual specialists.
B. Provide comprehensive, coordinated, patient-centered care by integrating acute concerns, chronic disease
management, prevention, and long-term follow-up.
C. Prioritize laboratory investigations before obtaining a complete clinical history.
D. Restrict management to conditions affecting a single organ system.
Best Answer
B. Provide comprehensive, coordinated, patient-centered care by integrating acute concerns, chronic disease
management, prevention, and long-term follow-up.
Key Clinical Insight
Internal medicine emphasizes comprehensive care of the whole adult patient rather than isolated diseases.
Internists integrate acute and chronic conditions, preventive care, medication optimization, and coordination
with other healthcare professionals to improve long-term outcomes and quality of life.
Why the Other Options Are Less Appropriate
A. Internists coordinate care and do not limit management to a single complaint.
C. A thorough history and physical examination should guide appropriate investigations.
D. Internal medicine addresses multisystem disease rather than a single organ.
Clinical Pearl
Patients with multiple chronic illnesses benefit most when one physician coordinates their overall medical care.
Harrison's High-Yield Point
The defining responsibility of the internist is comprehensive, patient-centered management of adult patients
with single or multiple medical conditions.
Clinical Challenge 2
Learning Objective: Apply patient-centered care to clinical decision-making.
A 56-year-old woman with recently diagnosed rheumatoid arthritis returns for a follow-up consultation after
being advised to start disease-modifying therapy. She expresses concern about potential adverse effects
because her mother experienced severe medication toxicity during cancer treatment. She is the primary
caregiver for her elderly husband and worries that frequent hospital visits may interfere with her
,responsibilities. After reviewing the available evidence, the internist discusses the benefits, risks, monitoring
requirements, alternative treatment options, and the patient's personal goals before reaching a management
decision together with her.
Which principle of modern internal medicine is BEST demonstrated in this consultation?
A. Physician-directed decision-making
B. Patient-centered care
C. Defensive medicine
D. Therapeutic privilege
Best Answer
B. Patient-centered care
Key Clinical Insight
Patient-centered care combines the best available clinical evidence with the patient's values, preferences,
lifestyle, and goals. Management decisions should address not only the disease but also the individual's
circumstances and priorities.
Why the Other Options Are Less Appropriate
A. Physician-directed decision-making limits patient involvement in selecting treatment.
C. Defensive medicine emphasizes reducing medicolegal risk rather than optimizing patient care.
D. Therapeutic privilege refers to withholding information under exceptional circumstances and is not
appropriate in this scenario.
Clinical Pearl
Successful long-term management depends on understanding what matters most to the patient—not just what
is medically appropriate.
Harrison's High-Yield Point
Patient-centered care integrates clinical evidence with individual patient values to achieve informed, shared
healthcare decisions.
Clinical Challenge 3
Learning Objective: Recognize the importance of clinical reasoning in evaluating complex presentations.
A 72-year-old man presents with progressive fatigue, anorexia, weight loss, intermittent low-grade fever,
and generalized weakness over four months. Examination reveals pallor, mild hepatomegaly, and a palpable
left supraclavicular lymph node. Initial investigations demonstrate normocytic anemia, elevated erythrocyte
sedimentation rate, and mild hypoalbuminemia. Rather than concluding that a single disease explains all
,findings, the internist develops several diagnostic possibilities, prioritizes them according to probability, and
plans targeted investigations to confirm or exclude each possibility.
Which aspect of clinical reasoning is MOST appropriately demonstrated?
A. Premature diagnostic closure
B. Structured hypothesis generation
C. Confirmation bias
D. Availability heuristic
Best Answer
B. Structured hypothesis generation
Key Clinical Insight
Clinical reasoning begins with generating multiple diagnostic hypotheses based on the available evidence.
These hypotheses are continuously revised as additional clinical information becomes available, improving
diagnostic accuracy.
Why the Other Options Are Less Appropriate
A. Premature diagnostic closure accepts a diagnosis before adequate evaluation.
C. Confirmation bias emphasizes evidence supporting an existing assumption while ignoring conflicting
findings.
D. Availability heuristic relies on recently encountered diagnoses rather than objective clinical assessment.
Clinical Pearl
Experienced internists actively challenge their initial diagnostic impressions throughout the patient's
evaluation.
Harrison's High-Yield Point
Accurate diagnosis depends on structured clinical reasoning rather than relying on a single early impression.
Clinical Challenge 4
Learning Objective: Apply the principles of differential diagnosis when evaluating patients with nonspecific
clinical presentations.
A 63-year-old man presents with a 2-month history of fatigue, decreased appetite, intermittent fever, and a
5-kg unintentional weight loss. He has a history of hypertension but is otherwise healthy. Physical examination
reveals mild pallor and a firm left supraclavicular lymph node. Laboratory studies demonstrate normocytic
anemia and an elevated C-reactive protein level. Before requesting additional investigations, the attending
,physician reminds the residents that several serious conditions can present with similar constitutional
symptoms and that each possibility should be considered systematically before reaching a diagnosis.
Which of the following BEST reflects this diagnostic approach?
A. Confirm the most likely diagnosis immediately to avoid unnecessary investigations.
B. Develop and prioritize a differential diagnosis before confirming the underlying disease.
C. Begin empirical treatment before completing the evaluation.
D. Focus only on the most common disease associated with weight loss.
Best Answer
B. Develop and prioritize a differential diagnosis before confirming the underlying disease.
Key Clinical Insight
A structured differential diagnosis allows clinicians to evaluate multiple possible conditions objectively,
reducing diagnostic error while guiding appropriate investigations.
Why the Other Options Are Less Appropriate
A. Early diagnostic closure increases the risk of missed diagnoses.
C. Empirical treatment may delay identification of the underlying condition.
D. Common diseases should be considered, but uncommon yet serious conditions must not be overlooked.
Clinical Pearl
Constitutional symptoms often require a broad differential diagnosis before targeted investigations are
selected.
Harrison's High-Yield Point
Diagnostic accuracy improves when clinicians systematically consider and prioritize multiple possible
diagnoses.
Clinical Challenge 5
Learning Objective: Recognize the role of evidence-informed clinical decision-making.
A 58-year-old woman with newly diagnosed osteoporosis asks whether she should begin medication after
reading conflicting health information online. The internist reviews current clinical guidelines, discusses the
quality of available evidence, estimates her future fracture risk, and explains the expected benefits and
potential adverse effects of treatment before making a recommendation.
Which principle of modern internal medicine is MOST clearly demonstrated?
A. Evidence-informed clinical practice
B. Physician preference
,C. Defensive medicine
D. Routine protocol-based care regardless of patient factors
Best Answer
A. Evidence-informed clinical practice
Key Clinical Insight
Evidence-informed practice combines high-quality scientific evidence with clinical expertise and individual
patient preferences to support appropriate healthcare decisions.
Why the Other Options Are Less Appropriate
B. Personal preference alone should not determine management.
C. Defensive medicine prioritizes medicolegal concerns rather than patient benefit.
D. Clinical guidelines should be individualized for each patient.
Clinical Pearl
Clinical guidelines support—but never replace—sound clinical judgment.
Harrison's High-Yield Point
The best clinical decisions integrate research evidence, physician expertise, and patient values.
Clinical Challenge 6
Learning Objective: Recognize the importance of shared decision-making in internal medicine.
A 66-year-old man with newly diagnosed atrial fibrillation is advised to begin long-term oral anticoagulation
to reduce his risk of stroke. He expresses concern because a close relative experienced a major gastrointestinal
bleed while taking anticoagulants. The internist carefully explains the patient's individual stroke risk, bleeding
risk, available anticoagulant options, monitoring requirements, and lifestyle considerations before encouraging
him to participate in selecting the most appropriate treatment.
Which principle of patient care is BEST demonstrated in this consultation?
A. Physician-directed decision-making
B. Shared decision-making
C. Therapeutic privilege
D. Defensive medicine
Best Answer
B. Shared decision-making
, Key Clinical Insight
Shared decision-making combines the best available medical evidence with the patient's preferences, values,
and personal circumstances to reach an informed treatment decision.
Why the Other Options Are Less Appropriate
A. Physician-directed care limits patient participation.
C. Therapeutic privilege involves withholding information in exceptional circumstances.
D. Defensive medicine is driven primarily by legal concerns rather than patient-centered care.
Clinical Pearl
Patients are more likely to adhere to treatment plans they actively help develop.
Harrison's High-Yield Point
Shared decision-making is a cornerstone of patient-centered internal medicine.
Clinical Challenge 7
Learning Objective: Appreciate the importance of multidisciplinary care in managing complex patients.
A 74-year-old woman with heart failure, chronic kidney disease, diabetes mellitus, and frailty is admitted
because of worsening shortness of breath and peripheral edema. During her hospitalization, the internist
coordinates care with a cardiologist, nephrologist, pharmacist, dietitian, physiotherapist, diabetes educator,
and nursing staff to develop a comprehensive discharge plan that addresses her medical, nutritional,
functional, and social needs.
Which aspect of modern internal medicine is BEST illustrated by this approach?
A. Organ-specific management
B. Multidisciplinary team-based care
C. Episodic treatment
D. Independent physician practice
Best Answer
B. Multidisciplinary team-based care
Key Clinical Insight
Patients with multiple chronic illnesses often require coordinated input from different healthcare professionals
to optimize outcomes, reduce complications, and improve quality of life.
Why the Other Options Are Less Appropriate
A. Organ-specific management does not adequately address complex multisystem disease.