What Are the 4 Pillars of Medical Ethics? Clinical Guide

Every clinical decision involves more than picking a treatment or procedure. Physicians have an ethical obligation to benefit the patient, avoid or minimize harm, and respect the patient's values and preferences.

Thomas Percival first described medical ethics in 1803, and the American Medical Association established the world's first national code of medical ethics in May 1847 (with a comprehensive update completed in 2016). Modern clinical ethics centers on the four principles expounded by Beauchamp and Childress. Selection procedures for medical training positions also use tools such as the multiple mini-interview (MMI) and situational judgment tests (SJT) to evaluate candidates on professionalism, judgment, and communication.

If you are preparing for healthcare interviews, Confetto runs timed MMI and panel mock interviews with follow-up questions so you can practice talking through ethical scenarios out loud. Start your free week.

The philosophical foundation of autonomy, as interpreted by Immanuel Kant (1724 to 1804) and John Stuart Mill (1806 to 1873), is that all persons have intrinsic and unconditional worth and should have the power to make rational decisions and moral choices. Justice Benjamin Cardozo affirmed this principle in a 1914 court decision stating that every human being of adult years and sound mind has a right to determine what shall be done with his own body.

According to AMA Code of Medical Ethics Opinion 1.1.3 on Patient Rights, a patient with decision-making capacity may accept or refuse any recommended medical intervention. Under AMA Opinion 5.3, a patient with appropriate capacity also has the right to decline or halt any life-sustaining medical intervention, even when that decision is expected to lead to death.

Three core clinical duties spring directly from autonomy: informed consent, truth-telling, and confidentiality. For a medical, surgical, or research procedure, informed consent requires five specific elements: the patient or subject must be competent to understand and decide, receive a full disclosure, comprehend the disclosure, act voluntarily, and consent to the proposed action. StatPearls (updated April 2025) notes that patients must understand the diagnosis, the risks and benefits, and the treatment options, including the option of no treatment at all.

Autonomy does not extend to individuals who lack decision-making capacity, such as infants, children, and patients with incompetence from a developmental, mental, or physical disorder. A clinician's determination of incapacity carries the same practical weight as a legal court determination of incompetence. Clinicians detect incompetence using three generally accepted standards, applied alone or in combination: inability to state a preference or choice, inability to understand one's situation and its consequences, and inability to reason through a consequential life decision.

When a patient lacks capacity, a surrogate decision-maker steps in. If the patient was previously autonomous, their prior preferences (such as an advance directive) must be respected, though AMA Opinion 5.2 notes that an advance directive never overrides the current wishes of a patient who still has decision-making capacity. Surrogate decision-making and the remaining duties of autonomy follow specific rules:

• Substituted judgment standard: the surrogate decides based on what the patient would wish in this circumstance, not what the surrogate wishes.
• Best interests standard: the surrogate chooses what brings the highest net benefit to the patient after weighing risks and benefits.
• Substituted interests standard: proposed by Sulmasy and Snyder when the surrogate is uncertain of the patient's exact preferences or medical science has outpaced them, basing decisions on the patient's authentic values and interests.
• Truth-telling: disclosing the diagnosis and prognosis honestly. In 1961, 88% of surveyed US physicians preferred to avoid disclosing a cancer diagnosis, whereas by 1979, 98% favored full disclosure. Autonomous patients have the right to know their diagnosis, and they also have the right to forgo disclosure or delegate decision-making to a family member.
• Confidentiality: keeping patient information private unless authorized by the patient. Exceptions include sharing needed information with the care team, legally required reporting of gunshot wounds and sexually transmitted diseases, and situations that may cause major harm to others, such as infectious disease epidemics, HIV partner notification, and notifying relatives of certain genetic risks.

Beneficence is the positive obligation of a physician to act for the benefit of the patient and promote their welfare. Unlike nonmaleficence, which tells a clinician what not to do, beneficence sets positive requirements to actively help the patient.

In clinical practice, beneficence demands placing the interests of patients above those of the physician, curing disease when possible, maintaining or improving functional status and quality of life, promoting health, preventing disease and untimely death, educating patients, and providing relief near the time of death. Varkey notes that physician beneficence is both altruistic and a payback for the profession's debt to society for subsidized education, privileges, and the patients who contribute to medical learning and research. Beneficence supports five moral rules:

• Protect and defend the rights of others.
• Prevent harm from occurring to others.
• Remove conditions that will cause harm to others.
• Help persons with disabilities.
• Rescue persons in danger.

Nonmaleficence is the physician's obligation not to harm the patient. In daily practice, nonmaleficence requires weighing the benefits against the burdens of all interventions and treatments, avoiding treatments that are inappropriately burdensome, and choosing the best course of action for the patient.

This balance is central to end-of-life care, including withholding or withdrawing life-sustaining treatment, medically administered nutrition and hydration, and pain and symptom control. AMA Opinion 5.3 states that there is no ethical difference between withholding and withdrawing life-sustaining treatment, and when an intervention no longer helps achieve the patient's goals for care or desired quality of life, it is ethically appropriate to withdraw it.

Nonmaleficence also encompasses the doctrine of double effect: a physician's obligation and intention to relieve refractory pain or dyspnea using appropriate drugs, including opioids, overrides foreseen but unintended harmful effects or outcomes. Nonmaleficence supports five moral rules:

• Do not kill.
• Do not cause pain or suffering.
• Do not incapacitate.
• Do not cause offense.
• Do not deprive others of the goods of life.

Justice is the fair, equitable, and appropriate treatment of persons. The category most relevant to clinical ethics is distributive justice, which governs the fair, equitable, and appropriate distribution of healthcare resources determined by justified social norms.

Distributive justice applies to allotting scarce resources (equipment, tests, medications, and organ transplants), caring for uninsured patients, and allotting outpatient visit time. In emergency departments, StatPearls points out that every decision to prioritize one patient implies a deprioritization of other waiting patients. AMA Principle IX states that a physician shall support access to medical care for all people, and AMA Opinion 11.1.4 states that physicians individually and collectively have an ethical responsibility to ensure all persons have access to needed care regardless of economic means.

Justice also prohibits acting on conflicts of interest, such as prescribing an expensive drug over an equally effective, less expensive drug because it benefits the physician financially or professionally. Bioethics recognizes six valid principles of distributive justice, often combined in practice:

• To each person an equal share.
• According to need.
• According to effort.
• According to contribution.
• According to merit.
• According to free-market exchanges.

Each of the four pillars is a prima facie obligation, meaning it must be fulfilled unless it conflicts in a specific instance with another principle. When two principles collide, the physician weighs the competing prima facie obligations based on content and context.

When a patient in shock receives urgent fluid resuscitation through an intravenous catheter that causes pain and swelling, beneficence easily overrides nonmaleficence. Conflict is sharpest when beneficence and autonomy collide, such as when a competent patient refuses a life-saving intervention or asks to withdraw mechanical ventilation. Giving beneficence primacy over autonomy is paternalism (or parentalism), which ethicists divide alongside its opposite extreme, consumerism:

• Soft paternalism: The physician acts on grounds of beneficence or nonmaleficence when a patient is nonautonomous or substantially nonautonomous (for example, due to cognitive dysfunction from severe illness, depression, or drug addiction). Soft paternalism is ethically defensible if it aligns with what the physician believes to be the patient's values.
• Hard paternalism: The physician acts to benefit a patient against the voluntary decision of an autonomous patient who is fully informed and competent. Hard paternalism is ethically indefensible.
• Consumerism: An extreme, rare form of patient autonomy where the physician's role is reduced to listing medical facts and choices while the informed patient selects from the list. Because it prevents the physician from using their knowledge and skills to benefit the patient, it amounts to patient abandonment and is ethically indefensible.

In Clinical Ethics: A Practical Approach to Ethical Decisions in Clinical Medicine, Jonsen, Siegler, and Winslade laid out a systematic four-pronged model that maps to the four pillars, as presented in Varkey's review:

• Step 1: Clinical assessment (Beneficence and Nonmaleficence). Identify whether the illness is acute, chronic, reversible, or terminal, the treatment goals and options, probabilities of success, whether benefits outweigh adverse effects, the effect of no treatment, and plans for limiting or stopping treatment.
• Step 2: Patient rights and preferences (Autonomy). Check whether the patient received and understood benefit-risk information and gave consent, whether they are mentally competent, or, if incompetent, what their prior preferences were and who the appropriate surrogate is.
• Step 3: Quality of life (Beneficence, Nonmaleficence, and Autonomy). Evaluate expected quality of life (physical, mental, and social deficits) with and without treatment, who judges quality of life for an incapacitated patient, possible physician bias, and the rationale for forgoing life support.
• Step 4: External forces and context (Distributive Justice). Examine physician financial, professional, research, educational, or religious conflicts of interest, legal and third-party payer issues, public health and safety risks, and scarce resource allocation.
• Case 1: Altered mental status refusal (Beneficence overrides Autonomy). A drowsy 20-year-old student with a 40°C fever, neck rigidity, and spinal fluid showing Gram-positive diplococci (bacterial meningitis) refuses antibiotics and hospitalization without reason. Because temporary mental incapacity from severe illness prevents reasoned judgment and meningitis threatens death or disability, beneficence prevails and the physician treats him.
• Case 2: Competent refusal of surgery (Autonomy overrides Beneficence). A mentally competent 56-year-old lawyer and 30-year pack-a-day smoker with a 5 cm right upper lobe lung mass understands that delaying biopsy and resection risks metastasis, but refuses surgery out of fear. His autonomous refusal must be respected, but the physician cannot abandon him and must offer continued visits, periodic tests, and a second opinion.
• Case 3: Physiological futility in the ICU (Nonmaleficence and Beneficence guide withdrawal). An intubated 71-year-old man with end-stage COPD, pneumonia, sepsis, and multisystem organ failure (systolic BP below 60 mm Hg on vasopressors, oxygen saturation below 80%, arterial pH 7.0, anuria, creatinine 5 mg/dL, and coma) has no advance directive or proxy. Because continued vasopressors and ventilation are physiologically futile, the team should compassionately discuss withdrawing life support with his family and provide palliative care.
• Case 4: Family request to withhold cancer diagnosis (Autonomy includes delegation). A 67-year-old widow from southern India with basic English has jaundice and weight loss. Her son asks the doctor to hide any cancer diagnosis from her and let him make all decisions. Tests show pancreatic cancer. Using a translator, the physician tactfully informs the patient that her condition requires treatment decisions and asks whether she wants to make them herself or delegate all information and authority to her son.
• Case 5: Disclosing a surgical error (Autonomy and Truth-Telling require disclosure). Three weeks after a cholecystectomy, a 45-year-old woman returns with fever and abdominal pain, and a second surgery removes a retained surgical sponge. Truth-telling requires the surgeon to disclose the error and its consequences to the patient, apologize, and report the incident to hospital quality and risk management committees.
• Case 6: One ventilator for two COVID-19 patients (Distributive Justice). A 74-year-old retired nurse with prior strokes and hypertension and a healthy 22-year-old second-year medical student both arrive in acute respiratory failure needing the last ventilator. Triage cannot rely on wealth, social standing, or first-come, first-served. Under clinical ethics consensus, maximizing benefits (life-years saved and survival likelihood) is the dominant value, supported by instrumental value as a future healthcare worker. The 22-year-old receives the ventilator, and a separate triage committee not caring for the patients should make the decision to protect frontline staff from emotional toll.

A 67-year-old patient who speaks limited English is admitted with jaundice and weight loss. Before tests are completed, her adult son pulls you aside and asks you not to tell his mother if the results show cancer, saying the shock would harm her and that in their family's culture he makes all medical decisions. Diagnostic imaging and biopsy confirm pancreatic cancer. How do you handle this situation?

• Principles of Clinical Ethics and Their Application to Practice (Varkey, Medical Principles and Practice / PMC7923912)
• Ethical Issues in Academic Medicine (Huecker & Shreffler, StatPearls / NCBI Bookshelf)
• AMA Code of Medical Ethics: Opinion 1.1.3 Patient Rights & Related Opinions
• AMA Principles of Medical Ethics
• AMA Code of Medical Ethics Overview
• Dismissed Psychiatry Residents Who Appeal: Exploring Unprofessional Behavior (Godschalx & van Mook, Academic Psychiatry / PMC10447273)