For decades, psychotherapy has been framed in the public consciousness as an unalloyed good—a safe, supportive environment where the only outcome of "doing the work" is personal growth. However, a growing body of psychological research is beginning to pull back the curtain on the "dark side" of the therapeutic encounter. Recent studies published in major journals, and highlighted by the advocacy group Mad in America, suggest that negative effects are not only common but are frequently misunderstood, underreported, and even dismissed by the very clinicians tasked with healing.
This comprehensive review examines three pivotal areas of recent inquiry: the broad prevalence and causes of negative events in therapy, the psychological mechanism of the "nocebo effect," and the startling disconnect between how patients and clinicians perceive treatment-induced harm.
Main Facts: The Prevalence of Therapeutic Harm
The assumption that "therapy might not help, but it can’t hurt" is being systematically dismantled by contemporary data. According to a narrative review led by Dushad Ram of Shaqra University and published in the Industrial Psychiatry Journal, negative events in psychotherapy are far from anomalous. When researchers apply a broad definition of "adverse events"—encompassing unmet expectations, general dissatisfaction, and worsening symptoms—an astounding 95.6% of patients report experiencing at least one negative aspect during their treatment.
The research categorizes these negative outcomes into three distinct tiers:
- Predictable Side Effects (33%–41%): These are negative experiences that occur even when treatment is applied correctly. Examples include the temporary emotional exhaustion following a difficult session or the heightened anxiety inherent in exposure therapy for PTSD.
- Adverse Effects (5%–10%): These represent unexpected and harmful deteriorations. Patients in this category may develop entirely new symptoms, experience a breakdown in family relationships, or feel a profound loss of autonomy and control over their lives.
- Malpractice and Unethical Treatment (2.6%): This involves severe breaches of professional conduct, including misdiagnosis, sexual harassment, boundary violations, and inappropriate power dynamics.
The data suggests that while the most severe forms of malpractice are relatively rare, the "middle ground" of adverse effects—where therapy actively makes a patient’s life worse—is significant enough to warrant a major shift in clinical oversight.
Chronology of the Research: From Recognition to Mitigation
The academic journey toward understanding therapeutic harm has moved from identifying the problem to exploring its psychological roots and, finally, to assessing the clinical barriers to improvement.
The Rise of the "Nocebo" Concept in Mental Health
Following the general identification of adverse events, researchers like Andrea W. M. Evers of Leiden University have focused on the "nocebo effect"—the inverse of the placebo effect. Published in Current Opinion in Psychology, Evers’ work explores how negative expectations can physically and psychologically manifest as poorer outcomes.
Historically, the placebo effect has been lauded in psychotherapy as a "common factor" that drives healing. However, the nocebo effect suggests that if a patient enters therapy expecting it to be painful, confrontational, or ineffective, those expectations often become self-fulfilling prophecies. Evers identifies five primary triggers for this effect:
- Negative Expectations: Anticipating pain or failure.
- Previous Trauma in Treatment: "Evolutionary bias" causes humans to prioritize past negative experiences, making one bad therapist harder to overcome than ten good ones.
- Clinician Communication: Therapists who overemphasize the "difficulty" of the work may inadvertently trigger a nocebo response.
- Social Learning: Negative portrayals of therapy in media or social circles.
- Contextual Factors: Systemic issues, such as being stuck on a long waiting list, which can cause symptoms to deteriorate before the first session even begins.
The Recent Dutch Studies on Clinician Perception
The most recent stage of this research involves looking at the gatekeepers themselves. Studies led by Sanne T. L. Houben at Maastricht University (2026) surveyed Dutch clinical psychologists to see if they were even aware of these risks. The findings revealed a troubling gap between patient reality and clinical perception, marking a new chapter in the push for transparency in mental health care.
Supporting Data: The Clinician-Patient Disconnect
The research conducted by Houben and her team utilized two separate studies to quantify how clinicians view the risks of their own profession. The results suggest a culture of "clinical dismissal" regarding therapy-induced harm.
Disagreement on What Constitutes "Harm"
There is no professional consensus on what a "negative effect" actually is. In the Dutch study, clinicians were split down the middle on several key issues:
- Feeling Worse: 51.6% of clinicians viewed a patient feeling worse as a negative effect of therapy, while 48.8% dismissed it as unrelated to the treatment.
- Stigma: Only half of the clinicians acknowledged that a patient’s fear of being "found out" as a therapy-goer was a legitimate negative effect of the process.
- Economic Impact: 51.5% recognized that therapy could lead to fewer opportunities in the labor market, while the other 48.5% dismissed this concern entirely.
The Myth of Unavoidability
Perhaps the most striking data point is the number of clinicians who believe that negative effects are "unavoidable" and therefore do not require intervention. A significant portion of the surveyed psychologists believed that when a patient experiences increased stress or worsening symptoms, there is nothing the clinician could have done to prevent it. This "inevitability" mindset often leads to a failure in providing informed consent.
The study found that while 51% to 61% of clinicians claimed to be familiar with negative effects, only 70% of those "familiar" therapists actually discussed these risks with their clients. For those with low familiarity, the number dropped to 32.1%. This means a vast majority of patients are entering therapy without a clear understanding of the potential for psychological deterioration.
Official Responses and Expert Perspectives
The authors of these studies are calling for a radical restructuring of how psychotherapy is taught and practiced.
Dr. Dushad Ram and his colleagues emphasize the need for "standardized monitoring." They argue that if therapy is to be treated as a medical intervention, it must have a reporting system for "adverse drug reactions," so to speak. They specifically highlight that young people, trauma survivors, and ethnic minorities are at the highest risk. For minorities, the harm often stems from "Westernized models" that fail to account for cultural values, leading to a "cultural mismatch" that can be deeply alienating.
Dr. Andrea Evers suggests that clinicians must become "expectation managers." Rather than ignoring the nocebo effect, therapists should use self-report screeners to identify patients who are excessively worried about the process. She recommends "reconditioning" past negative treatment experiences as a formal part of the new therapeutic alliance.
The Maastricht Team (Houben et al.) points out the ethical failure of the current "desirability bias." Clinicians, they argue, are prone to reporting what makes them look good rather than what is true. They suggest that the small sample sizes and the specific Dutch context of their study are limitations, but the trend of clinicians dismissing patient-reported side effects—such as becoming overly dependent on the therapist—is a universal concern that requires global attention.
Implications: The Future of Informed Consent
The implications of this research are profound for the future of mental health care. If the vast majority of patients experience some form of negative event, and nearly half of clinicians dismiss these events as "unrelated" or "unavoidable," the field is facing a crisis of accountability.
1. The Ethical Mandate for Informed Consent
In physical medicine, a surgeon must disclose the risk of infection or death before a procedure. In psychotherapy, the risk of "symptom exacerbation" or "strained family relationships" is rarely discussed with the same gravity. These studies suggest that informed consent must become a rigorous, ongoing conversation rather than a signed form at the intake session.
2. Training and Cultural Competence
The high rate of harm among ethnic and cultural minorities indicates that "one-size-fits-all" psychological models are actively causing distress. There is an urgent need for training that moves beyond Western-centric frameworks and addresses the power dynamics inherent in the therapist-patient relationship.
3. Redefining "Success"
The research challenges the industry to redefine success. If a patient’s symptoms improve but they become dangerously dependent on their therapist or lose their standing in their community, has the therapy truly succeeded? By acknowledging the "nocebo" triggers and the potential for adverse effects, the field can move toward a more holistic and honest model of healing.
In conclusion, while psychotherapy remains a vital tool for many, it is not a risk-free intervention. As these three studies illustrate, acknowledging the potential for harm is the first step toward preventing it. The "shadow" of the couch must be brought into the light if the profession is to maintain its mandate of "doing no harm."
