Hypnosis is not dangerous for most people. When conducted by a trained professional, it carries fewer adverse events than many standard therapeutic approaches. In one clinical trial comparing hypnosis to standard care during medical procedures, only 12% of patients in the hypnosis group experienced any adverse event, compared to 26% in the standard care group. That said, hypnosis does carry real risks in specific situations, and understanding those risks helps you make a smart decision about whether it’s right for you.
Common Side Effects Are Mild and Brief
The most frequently reported side effects of hypnosis are headache, dizziness, and mild anxiety. These are typically short-lived, resolving within minutes to hours after a session ends. Some people experience a feeling of grogginess or emotional heaviness, similar to what you might feel after waking from a particularly vivid dream. People who are highly responsive to hypnotic suggestions tend to report these effects more often, likely because they engage more deeply with the process.
Emotional reactions can also surface during a session. A person working through grief, trauma, or chronic pain may find that strong feelings emerge unexpectedly. This isn’t inherently harmful, and in a clinical setting a trained therapist can guide the process. But it does mean hypnosis isn’t a passive, neutral experience. Your emotional state going in matters, and so does the skill of the person guiding you.
The Real Risk: False Memories
The most well-documented danger of hypnosis isn’t physical. It’s the creation of false memories. When a hypnotist uses a technique called age regression, asking you to mentally travel back to an earlier time in your life, the memories that surface can feel vivid and real. The problem is they may not be real at all. Your brain, in a highly suggestible state, can construct detailed scenes from a mix of imagination, suggestion, and genuine fragments of memory. You then walk away believing something happened that never did.
This has had serious consequences. In therapeutic and legal settings, people have “recovered” memories of abuse that later turned out to be fabrications, sometimes destroying families and resulting in wrongful accusations. The mechanism behind this is called source misattribution: your brain mistakes an imagined scene for a genuine memory because the imagery felt so realistic. Guided imagery techniques, where a therapist asks you to visualize specific scenarios, carry a similar risk. Realistic imagery is more likely to produce false memories than metaphorical or abstract imagery.
It’s worth noting that memory distortion isn’t unique to hypnosis. It can happen in any therapeutic context where imagination is encouraged. But hypnosis amplifies the risk because it specifically increases suggestibility and can blur the line between what’s imagined and what’s remembered. Any practitioner who claims hypnosis can reliably recover buried or forgotten memories is working against decades of scientific evidence.
Who Should Avoid Hypnosis
For most healthy adults, hypnosis poses no meaningful risk. But certain conditions make it a poor fit. The Mayo Clinic notes that hypnosis may not be safe for people with severe mental illness. Specifically, individuals with psychotic disorders or dissociative conditions face higher stakes because hypnosis involves altered awareness and heightened suggestibility, both of which can destabilize an already fragile mental state.
The more serious complications documented in the literature, including prolonged dissociative episodes, seizures, and worsening of existing psychological conditions, have occurred almost exclusively in two contexts: clinical use with vulnerable patients and stage entertainment. In both cases, the common thread is a lack of appropriate screening. A qualified clinician will evaluate your mental health history before beginning any hypnosis work. A stage hypnotist pulling volunteers from an audience will not.
Stage Hypnosis Carries Higher Risk
Entertainment hypnosis operates under fundamentally different conditions than clinical practice. There’s no intake screening, no knowledge of a volunteer’s psychiatric history, no follow-up, and strong social pressure to perform for an audience. The hypnotist’s goal is spectacle, not wellbeing.
Documented cases of harm from stage hypnosis are difficult to track because they rarely make it into peer-reviewed literature. Researchers searching English-language publications found only two formally documented cases of damage from entertainment hypnosis, yet newspaper reports suggest such incidents happen far more often than the academic record shows. The gap exists because participants often don’t connect their symptoms to the show, don’t know where to report them, or feel embarrassed about having volunteered. Several countries and jurisdictions have pursued legislation to ban or restrict stage hypnosis specifically because of these concerns.
You Stay in Control
One of the most persistent fears about hypnosis is losing control, the idea that a hypnotist could make you do something against your will. This doesn’t hold up. Hypnosis involves a shift in attention and an increase in suggestibility, but it doesn’t override your values, judgment, or ability to refuse. You can open your eyes, speak up, or end the session at any point.
Research into the relationship between hypnotic suggestibility and self-control found that people who score high on suggestibility aren’t simply people with less willpower. In a study of 154 participants, suggestibility correlated with a specific type of impulsivity related to planning, not with a general inability to regulate behavior. People who respond well to hypnosis tend to be imaginative and absorptive, not passive or easily manipulated. The trance state involves some reduction in the kind of executive brain function associated with critical evaluation, which is partly why suggestions feel more compelling. But this is a temporary, voluntary shift, not a loss of agency.
What Makes a Practitioner Qualified
The difference between safe and risky hypnosis often comes down to who’s doing it. In the United States, no single federal license governs hypnotherapy, which means anyone can technically call themselves a hypnotist. The American Society of Clinical Hypnosis (ASCH) sets the most widely recognized professional standard. To earn ASCH certification, a practitioner must hold at least a master’s degree in a health care discipline, maintain state licensure to practice independently, complete two levels of approved clinical workshops, log a minimum of 20 hours of individualized training with an approved consultant, and have at least two years of independent practice using clinical hypnosis.
Certification must be renewed every three years, with at least 20 hours of continuing education required each cycle. The consultant-level credential requires 40 additional hours of advanced training and a minimum of five years of practice. When choosing a hypnotherapist, looking for ASCH certification or equivalent credentials from the Society for Clinical and Experimental Hypnosis (SCEH) is a practical way to filter out undertrained practitioners.
Self-Hypnosis Apps and Digital Tools
The growing availability of hypnosis apps raises a separate set of questions. A systematic review of hypnosis apps found that fewer than 3% are evidence-based, meaning the vast majority are built without scientific input or clinical validation. Most target relaxation and stress, which are lower-risk applications, but the lack of oversight means quality varies enormously.
The best safety data available comes from a large-scale study of one specific app, Reveri, which tracked over 84,000 users. Out of that entire group, only ten reported worsening symptoms or other problems, all of which were minor. That’s an encouraging signal for app-based self-hypnosis focused on stress management, but it doesn’t mean every app on the market is equally safe. If you’re using a digital tool, sticking with one that has published research behind it reduces the chance of a poor experience.