USMLE Step 1

USMLE Step 1 practice questions by topic

Free, exam-style USMLE Step 1 MCQs with worked answers and source-cited explanations. Pick a topic below, or generate unlimited questions from your own notes.

Renal

Acid–Base DisordersAcid-base disorders are common clinical problems that require a solid understanding of renal and respiratory physiology.5 questions with explanationsNephritic vs Nephrotic SyndromeNephritic and nephrotic syndromes represent two distinct patterns of glomerular disease, each characterized by a unique constellation of clinical features, underlying pathophysiology, and typical etiologies.5 questions with explanations

Endocrine

Adrenal DisordersAdrenal disorders on USMLE Step 1 center on excess or deficiency of cortisol, aldosterone, and adrenal androgens/catecholamines, and on tracing each clinical picture back to a specific enzymatic or feedback defect.5 questions with explanationsThyroid DisordersThyroid disorders are a high-yield endocrine topic on Step 1 spanning autoimmune disease (Graves disease, Hashimoto thyroiditis), neoplasia (papillary and medullary carcinoma), and the physiology of the hypothalamic-pituitary-thyroid axis.5 questions with explanations

General Pharmacology

AntibioticsAntibiotics are a critical class of drugs used to treat bacterial infections.5 questions with explanationsAutonomic PharmacologyAutonomic pharmacology focuses on drugs that modulate the sympathetic and parasympathetic nervous systems, which are crucial for regulating involuntary bodily functions.5 questions with explanations

Cardiovascular

ArrhythmiasArrhythmias, or abnormal heart rhythms, are a high-yield topic for USMLE Step 1, requiring a strong understanding of cardiac electrophysiology, normal conduction pathways, and the mechanisms underlying various rhythm disturbances.5 questions with explanationsCardiac PharmacologyCardiac pharmacology is a high-yield area for USMLE Step 1, focusing on the mechanisms of action of drugs used to treat cardiovascular conditions.5 questions with explanationsHeart FailureHeart failure is a complex clinical syndrome resulting from structural or functional impairment of ventricular filling or ejection of blood, leading to symptoms like dyspnea and fatigue, and signs like elevated jugular venous pressure.5 questions with explanations

Respiratory

COPDChronic obstructive pulmonary disease (COPD) is an umbrella term for chronic bronchitis and emphysema, both characterized by irreversible airflow obstruction (decreased FEV1/FVC) most commonly caused by cigarette smoking.5 questions with explanations

Reproductive

Male Reproductive PathologyMale reproductive pathology on Step 1 centers on testicular germ cell tumors, benign and malignant prostate disease, and genetic/anatomic causes of infertility.5 questions with explanations

Neurology

MeningitisMeningitis is inflammation of the meninges, most often caused by bacterial, viral, or fungal pathogens that gain access to the subarachnoid space via hematogenous spread, contiguous spread, or direct inoculation.5 questions with explanationsSeizure DisordersSeizure disorders arise from abnormal, synchronized neuronal firing that can be focal (originating in one hemisphere) or generalized (involving bilateral networks from onset).5 questions with explanationsStrokeStroke is a sudden focal neurologic deficit caused by disruption of cerebral blood flow, either ischemic (~85% of cases, due to thrombosis, embolism, small-vessel lipohyalinosis, or global hypoperfusion) or hemorrhagic (~15%, due to vessel rupture).5 questions with explanations

Musculoskeletal

Muscle PhysiologyMuscle physiology on USMLE Step 1 centers on the molecular mechanisms that convert an action potential into force generation and relaxation across skeletal, cardiac, and smooth muscle.5 questions with explanations

How to use these USMLE Step 1 questions

This page collects 15 USMLE Step 1 topics across 8 systems. Each topic opens with a short concept summary, then a set of exam-style questions. Answer every question before you read the explanation: retrieving the answer from memory is what makes the knowledge stick, and it shows you where your gaps really are.

When you get a question wrong, read why each distractor is incorrect, not just why the right answer is right. Return to the topic a few days later and try again. Once a topic feels solid, move on to the next system rather than repeating questions you already know.

These pages cover a sample of high-yield topics. To practise the exact material from your own course, upload your lecture notes and QuizMed will write USMLE Step 1-style questions from them. See how our questions are written and checked, or browse practice questions for other exams.

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