The case against legalizing euthanasia rests on several interlocking concerns: that it puts vulnerable people at risk, that depression distorts end-of-life decision-making, that eligibility criteria tend to expand over time, and that modern palliative care can address the suffering that drives most requests. These arguments come from disability rights advocates, medical ethicists, psychiatrists, and legal scholars, and they carry weight even among people who are broadly sympathetic to personal autonomy.
Depression Drives Many Requests for Death
One of the strongest arguments against euthanasia is that the desire to die is frequently a symptom of treatable mental illness rather than a rational, settled preference. Research on terminally ill patients consistently finds that psychological factors, not physical pain, are the chief drivers of wanting to hasten death. Depression, hopelessness, and loss of dignity outweigh pain levels and physical functioning as predictors.
The numbers are striking. In one landmark study, 59% of terminally ill patients who expressed a desire for hastened death had clinical depression, compared to just 8% of those who did not want to die sooner. A separate study found that depressed patients were four times as likely to want a hastened death (47% versus 12%). Hopelessness, in some analyses, was an even stronger predictor than depression itself. Even a history of depression, without active symptoms, increased vulnerability to wanting an early death.
This creates a serious problem for any legal framework. If a large share of euthanasia requests are shaped by a treatable condition, approving those requests means ending lives that might look very different after adequate psychiatric care. Screening for depression sounds straightforward in theory, but in practice, depression in the terminally ill is notoriously underdiagnosed and undertreated.
Eligibility Tends to Expand Over Time
Critics frequently point to what’s known as the “slippery slope,” and the data from countries with legal euthanasia lend this argument real weight. Belgium’s experience is the most documented example. When euthanasia became legal there, it was largely restricted to terminally ill cancer patients. Over the following years, the practice broadened to include non-malignant lung disease, cardiovascular disease, age-related conditions involving multiple illnesses, early-onset dementia, and psychiatric disorders.
The proportion of Belgian euthanasia cases based on psychiatric disorders or dementia rose from 0.5% of all cases in the period from 2002 to 2007 to 3.0% by 2013. Canada followed a similar trajectory, expanding its law in 2023 to allow requests based on psychiatric illness or dementia. Researchers describe this pattern as a conceptual “filling” of legal space: the practice starts with the most obviously eligible candidates, then gradually moves toward groups whose eligibility is far less clear, including people with non-terminal illness or purely psychological suffering.
For opponents, this trajectory is not a bug but a predictable feature. Once the principle is established that ending a life can be a legitimate medical response to suffering, the boundaries of “sufficient suffering” are inherently unstable.
Risks to Disabled and Vulnerable People
Disability rights organizations have been among the most vocal opponents of euthanasia laws, and their concerns go beyond the theoretical. Their core arguments include that disabled people may face direct pressure to opt for assisted dying, that they may be indirectly pressured through societal attitudes, and that the very existence of euthanasia laws reinforces the prejudice that disabled lives are less worth living.
The concern about indirect pressure is particularly hard to safeguard against. A person living with a serious disability who requires expensive care, who depends on family members for daily support, may internalize the message that they are a burden. Euthanasia laws, in this view, don’t just offer a choice; they create a new expectation that some people should consider that choice. Disability advocates argue that assisted dying further devalues the lives of disabled people and encourages them to give up rather than fight for better support and accommodations.
Doctors Cannot Accurately Predict Death
Euthanasia laws typically require a terminal diagnosis, but the accuracy of those predictions is far worse than most people assume. A major prospective study of 468 terminally ill patients found that only 20% of doctors’ survival estimates were accurate. Fully 63% were overoptimistic, meaning the patient died sooner than predicted, but 17% were overly pessimistic, meaning the patient lived significantly longer than expected. Overall, doctors overestimated survival by a factor of 5.3.
When accuracy was defined more generously, as predicting survival within half to double the actual time, still only 34% of predictions were correct. For 13% of patients, death came at least a month later than the doctor had predicted. These error rates mean that some patients deemed to have weeks left may actually have months, and a small number could have substantially more time than anyone anticipated. Building an irreversible decision around a prediction that is wrong four out of five times raises obvious concerns.
Palliative Care Addresses Most Suffering
Opponents of euthanasia argue that the suffering driving most requests can be managed without ending life. The evidence largely supports this. Upwards of 90% of cancer pain can be controlled through relatively simple methods: oral medications, patches, or similar approaches. Only a small percentage of patients require more invasive procedures. When combined with psychological support, spiritual care, and attention to dignity, modern palliative care can address the physical and emotional dimensions of dying for the vast majority of patients.
The concern is that legalizing euthanasia reduces the incentive to invest in palliative care. If a quick, inexpensive death is available, healthcare systems and insurers may be less motivated to fund the slower, more resource-intensive work of managing someone’s pain and preserving their quality of life in their final months. This is not purely hypothetical. Amicus curiae briefs submitted to the U.S. Supreme Court argued that “the cost effectiveness of hastened death is as undeniable as gravity” and that managed care pressures could push patients toward choosing death. The Court itself noted the potential for cost-saving motives to influence both legalization and individual decisions, speculating that many patients might choose assisted suicide to spare their families substantial end-of-life costs.
Financial Pressures on Patients and Families
The economic argument cuts in a direction many people don’t initially consider. End-of-life care is expensive. One analysis found that the mean cost for managed-care patients who died of breast cancer was over $21,000 in the last six months of life, with roughly $9,500 spent in the final month alone. When a legal, low-cost alternative to that spending exists, the worry is that the “choice” to die becomes entangled with financial guilt and systemic incentives.
This pressure doesn’t have to be explicit. A terminally ill person who knows their care costs thousands of dollars a week, who sees their family struggling, who understands that a legal option exists to end that financial drain, faces a decision that is no longer purely about their own suffering. Critics argue that in a society with deep inequalities in healthcare access, euthanasia will inevitably be shaped by who can afford alternatives and who cannot.
The Medical Profession’s Ethical Foundation
The Hippocratic tradition, which has shaped medical ethics for over two thousand years, explicitly prohibits physicians from administering poison. The original oath’s ban on euthanasia was not incidental; it was a core commitment that separated healers from those who could cause harm. The American Medical Association adopted ethical principles rooted in this tradition, and the Declaration of Geneva, updated as recently as 2017, was drafted in direct response to historical atrocities in which doctors participated in killing patients deemed unworthy of life.
The practical concern is what happens to the doctor-patient relationship when physicians have the legal authority to end life. A national survey of 1,117 U.S. adults found that 20% said they would trust their doctor less if euthanasia were legal, with higher rates of concern among older adults (27%) and Black Americans (32%). While the majority did not express reduced trust, the fact that the populations most vulnerable to healthcare disparities were the most concerned suggests the trust impact would not be evenly distributed. For communities with historical reasons to distrust the medical system, adding the power to end life to a physician’s toolkit carries a different weight.
The Sanctity of Life Principle
At the philosophical core of many arguments against euthanasia is the principle that human life has inherent, equal value regardless of its quality or condition. This principle has both religious and secular roots. Religious traditions hold that life is not personal property to dispose of, but something entrusted to individuals for higher purposes. The secular version is simpler: if the most fundamental thing you would not want done to you is to be killed, then the prohibition on killing carries a unique moral weight that overrides other considerations.
This principle leads to what ethicist Helga Kuhse described as the view that “it is absolutely prohibited intentionally to terminate life because all human life irrespective of its quality or kind is equally valuable and inviolable.” For those who hold this position, the question is not whether suffering is real or whether autonomy matters, but whether any amount of suffering justifies crossing a line that, once crossed, redefines what human life is worth.