Yes. Hypnosis played a limited but real part in both World War I and World War II, mainly in military medicine, psychiatric care, pain management, and research. It was not a secret weapon, a standard treatment for every combat stress reaction, or a method for reliably controlling soldiers’ behavior. Its wartime use was practical and uneven: some physicians and psychologists considered it useful, while others questioned its reliability and limits.
The clearest evidence concerns the treatment of wounded service members and psychological symptoms. Hypnosis was used alongside other approaches, including suggestion, psychotherapy, relaxation, occupational treatment, medication, and physical rehabilitation. Its role changed as military psychiatry developed and as clinicians gained more experience with combat-related conditions.
Was hypnosis used during World War I?
Yes. During and after World War I, physicians and psychologists used hypnotic methods with some wounded soldiers, especially those experiencing what was then called “shell shock.”
“Shell shock” was a broad and changing label. It could refer to physical symptoms after explosions, psychological distress, functional neurological symptoms, exhaustion, or reactions to prolonged combat. Some soldiers experienced paralysis, blindness, mutism, tremors, or loss of movement without a clearly identifiable structural injury. Clinicians debated the causes of these symptoms and often disagreed about how best to treat them.
Hypnosis was one method used to address certain functional symptoms. A clinician might use suggestion, focused attention, and relaxation to encourage the return of movement, speech, or other functions. These methods were sometimes combined with reassurance, education, physical exercises, and psychotherapy.
The history is complicated, however. Not every treatment described as hypnosis was conducted according to modern clinical standards. Some wartime physicians used forceful suggestion, intimidation, painful procedures, or disciplinary pressure. In some settings, the goal was not simply to relieve suffering but to return men to military service quickly. That context matters when evaluating historical reports of “successful” treatment.
What was “shell shock”?
“Shell shock” was not a single, clearly defined disorder. The term became popular during World War I, but medical opinion shifted over time.
Early in the war, some doctors thought that symptoms were caused by the physical effects of artillery explosions. Later, many military psychiatrists emphasized emotional shock, fear, exhaustion, and unconscious psychological processes. The same outward symptom could receive different explanations depending on the clinician, the military unit, and the period of the war.
Today, it is safer to describe many of these cases as involving a mixture of combat stress, trauma-related symptoms, functional neurological symptoms, depression, anxiety, exhaustion, or physical injury. Modern diagnostic categories do not map neatly onto the historical term.
Hypnosis was most relevant to cases in which symptoms appeared to be functional rather than caused by detectable tissue damage. Even then, results varied, and historical reports often came from clinicians who were promoting a particular treatment approach. That makes broad claims about success difficult to support.
Did hypnosis “cure” shell shock?
There is no sound basis for saying that hypnosis generally cured shell shock.
Some case reports described rapid improvement after suggestion or hypnotic treatment. Such reports are historically important, but they do not establish that hypnosis was effective for all patients or that improvement lasted. Wartime case reports often lacked control groups, standardized diagnoses, long-term follow-up, and consistent definitions of recovery.
A symptom may also improve because of several factors at once: rest, removal from combat, supportive care, expectation of recovery, physical rehabilitation, psychotherapy, or a change in the patient’s circumstances. In some cases, symptoms may have improved naturally over time.
A careful conclusion is that hypnotic suggestion sometimes appeared to help particular patients with particular symptoms, but the evidence does not justify presenting it as a universal or reliably curative treatment.
Which World War I clinicians used hypnosis?
Several physicians associated with military psychiatry used suggestion, hypnosis, or related methods, but their theories and practices differed.
British physician W. H. R. Rivers treated officers at Craiglockhart War Hospital and used psychological approaches that included discussion, support, and attention to the patient’s personal experience. His work is often mentioned in histories of wartime psychiatry, although it should not be reduced to hypnosis.
Other clinicians used more direct suggestion and hypnotic techniques for functional symptoms. The French neurologist Joseph Babinski and the British physician William S. Johnson are among the figures discussed in the broader history of wartime hysteria and functional neurological symptoms, though the exact methods varied from case to case.
The Austrian psychiatrist Max Nonne is especially associated with reports of hypnotic treatment during World War I. His published accounts described hypnotic procedures with soldiers who had severe functional symptoms. Those reports influenced later discussions, but they were not modern clinical trials and should be read with attention to their setting and limitations.
The larger point is that hypnosis formed one part of a wider group of suggestion-based and psychotherapeutic methods. It was not a unified military program.
Was hypnosis used to force soldiers back to duty?
Sometimes military treatment was shaped by pressure to restore personnel to service. That pressure affected many forms of wartime psychiatric care, not hypnosis alone.
Some military psychiatrists considered certain symptoms to be maintained by fear, expectation, or the patient’s belief that recovery was impossible. They used firm suggestion and rapid treatment to challenge those beliefs. In other settings, clinicians used painful or coercive methods. The ethical standards of the time were often different from those expected in contemporary health care.
It would be inaccurate to describe every use of hypnosis as coercive. Some clinicians used it in a supportive and therapeutic manner. It would be equally inaccurate to describe wartime hypnotic treatment as uniformly compassionate or voluntary. The patient’s rank, the military institution, the clinician’s theory, and the immediate demands of the war all influenced the encounter.
Did World War I change views of hypnosis?
World War I contributed to wider interest in psychological treatment, including suggestion and hypnosis, but it did not establish hypnosis as a standard military therapy.
The war produced an enormous number of wounded and distressed service members. Military doctors needed methods that could be delivered quickly and adapted to symptoms such as paralysis, tremor, mutism, insomnia, nightmares, anxiety, and exhaustion. Hypnosis appeared attractive in some cases because it could be used to focus attention, provide reassurance, and encourage a particular response.
At the same time, wartime experience exposed the limits of simple explanations. Symptoms did not always respond to suggestion, and apparent recovery did not always mean that the underlying distress had been resolved. The period also encouraged the growth of more systematic military psychiatry, rehabilitation programs, and psychological screening.
Was hypnosis used during World War II?
Yes, but its role during World War II was generally part of broader military psychiatry rather than a central treatment system.
Military clinicians used hypnosis and suggestion in selected cases involving anxiety, trauma-related symptoms, functional symptoms, pain, insomnia, and other psychological problems. The exact practice differed across countries and services. Documentation is uneven, and the evidence is stronger for some individual clinicians and institutions than for any single Allied or Axis-wide program.
During World War II, psychiatrists increasingly emphasized immediate treatment near the front, rapid return to function when appropriate, rest, reassurance, group support, and practical rehabilitation. These approaches were often described through concepts such as “forward treatment” or “battle exhaustion” care. Hypnosis could be included, but it was only one possible technique.
The main military focus was usually not hypnosis itself. It was the rapid assessment and treatment of service members whose emotional or behavioral symptoms interfered with functioning.
What did “battle exhaustion” mean?
“Battle exhaustion” was a wartime term for a range of psychological and physical reactions to combat. Depending on the context, it could include fatigue, anxiety, confusion, irritability, sleep problems, tremors, emotional numbing, and difficulty functioning.
The term was used partly to avoid treating every combat reaction as a permanent psychiatric illness. Military psychiatrists observed that some service members improved when removed from immediate danger, given food and sleep, and treated close to their units. This approach was not identical to modern trauma treatment, and it was not always applied in the same way.
Hypnosis could be used with some symptoms, especially when clinicians believed that focused suggestion might reduce anxiety, improve sleep, or change a functional symptom. But most accounts of World War II military psychiatry emphasize a combination of methods rather than a hypnosis-centered model.
Did the United States military have a hypnosis program?
There is no reliable basis for saying that the United States military had a single, standardized hypnosis program covering all personnel during World War II.
American military medicine included psychiatrists, psychologists, neurologists, physicians, nurses, and other clinicians with different training and views. Some had experience with hypnosis or suggestion. Others did not use it or considered it unsuitable for their patients.
Hypnosis also appeared in professional discussions about pain, anesthesia, behavior, and psychotherapy. Its presence in medical literature or at a military hospital does not show that it was routinely used across the armed forces.
A more accurate description is that hypnosis was available to some military clinicians as a specialized technique. Its use depended on the clinician, the patient, the symptom, and the treatment setting.
Was hypnosis used for battlefield surgery and pain?
Hypnotic methods were discussed and sometimes used for pain control and anesthesia, including during wartime. However, they did not replace chemical anesthesia or become the usual method for battlefield surgery.
Hypnosis may reduce pain perception for some people, but responses vary. Surgical anesthesia requires reliable control of pain, awareness, movement, and bodily responses. In military settings, clinicians generally needed methods that could be applied predictably and quickly under difficult conditions.
Historical accounts of hypnotic analgesia should therefore be interpreted carefully. A successful demonstration or case report does not show that hypnosis could routinely substitute for anesthesia in emergency surgery.
Was hypnosis used to treat trauma after World War II?
Hypnosis remained part of some postwar clinical practices, particularly in work involving anxiety, pain, behavioral symptoms, and trauma-related complaints. But it competed with many other approaches, including psychoanalysis, psychodynamic psychotherapy, behavioral methods, medication, rehabilitation, and later cognitive and trauma-focused treatments.
Postwar clinicians also became more cautious about making simple connections between combat experiences and symptoms. Some patients had persistent problems, while others recovered with time and support. The course of symptoms varied considerably.
Hypnosis could be useful as an adjunct for selected patients, but historical experience does not support presenting it as a complete treatment for war trauma.
Did the Nazis use hypnosis as a military weapon?
Popular stories sometimes claim that Nazi Germany developed powerful hypnosis programs for mind control, espionage, or the creation of obedient assassins. These stories are not supported by reliable historical evidence.
Germany had physicians and psychologists who studied hypnosis, suggestion, and related subjects. Hypnosis also had a long history in European medicine. But that fact does not establish the existence of a successful, large-scale military mind-control system.
Claims about hypnosis being used to create perfectly controlled agents usually confuse dramatic stories with documented history. Hypnosis does not give a hypnotist unlimited control over another person, and historical evidence does not support the idea that wartime governments possessed a dependable method for programming people to commit any act on command.
Did the Allies use hypnosis for espionage or interrogation?
There is no good evidence that hypnosis provided the Allies with a dependable method for extracting perfectly accurate secrets or controlling agents.
Hypnosis can affect attention, memory, expectation, and confidence. Those same features create serious problems in investigative settings. A person who is hypnotized may become more confident in an incorrect memory, incorporate suggestions into a report, or produce a mixture of accurate and inaccurate information.
For that reason, hypnosis is not a reliable truth machine. A vivid or confident account obtained under hypnosis should not automatically be treated as accurate.
Military and intelligence organizations did investigate many psychological techniques during the twentieth century. That broader interest should not be confused with proof that hypnosis offered dependable mind control or flawless interrogation.
Could hypnosis make someone reveal a secret?
There is no reliable reason to believe that hypnosis can force a person to reveal information that they are determined to withhold.
Hypnosis may change how a person responds to questions, but it does not remove the ordinary problems of memory, motivation, misunderstanding, and suggestion. A hypnotized person may answer more freely, but that does not mean the answers are complete or true.
In fact, hypnotic questioning can increase the risk of inaccurate recall. People may mistake imagination for memory, accept suggestions without realizing it, or become more certain about details that are wrong. The result may sound persuasive while remaining unreliable.
Could hypnosis create a “posthypnotic assassin”?
The idea of a posthypnotic assassin became popular through fiction, sensational accounts, and later cultural stories. Reliable evidence does not show that hypnosis could consistently turn an unwilling person into a programmed killer.
Posthypnotic suggestions can influence behavior in some circumstances, but their effects are limited and variable. A person’s values, expectations, situation, and awareness all matter. Suggestions that conflict strongly with a person’s intentions may be resisted, ignored, reinterpreted, or followed only in a harmless way.
This does not mean that suggestion is powerless. Social pressure, authority, fear, group influence, propaganda, sleep loss, and coercion can all affect behavior. But those influences should not be confused with a special hypnotic ability to take total control of a person.
Was hypnosis used to help veterans?
Some veterans received hypnotic treatment after the wars, particularly for pain, anxiety, sleep problems, functional symptoms, and other complaints. The extent and quality of care varied widely.
A veteran’s difficulties might be related to combat trauma, physical injury, grief, substance use, family stress, occupational problems, or several factors at once. Hypnosis could be considered as one component of care, but it was not appropriate for every person or every condition.
Modern clinical practice also places importance on informed consent, careful assessment, treatment goals, and coordination with appropriate medical or mental health care. A historical account of hypnosis should not be treated as a recommendation for self-treatment or as a substitute for professional evaluation.
What does the historical evidence actually show?
The evidence supports several cautious conclusions:
Hypnosis and suggestion were used by some military clinicians during both world wars.
Their main applications involved selected medical and psychological symptoms, not universal mind control.
World War I accounts often focused on shell shock and functional symptoms.
World War II use was generally embedded within broader military psychiatry and rehabilitation.
Case reports and retrospective accounts cannot establish consistent effectiveness.
Hypnosis did not become a standard replacement for anesthesia, psychotherapy, or military psychiatric care.
Claims about hypnotically controlled assassins, perfect interrogation, or large-scale wartime mind control are not supported by reliable evidence.
The most balanced answer is therefore yes, hypnosis played a part—but a specialized and limited one. Its wartime history is best understood as part of the development of military medicine and psychiatry, not as a story of secret powers.
Why does this history still matter?
The history of hypnosis in wartime raises useful questions about treatment, authority, memory, and evidence.
First, it shows how clinicians respond when large numbers of people develop unfamiliar symptoms under extreme conditions. Second, it illustrates the danger of judging historical treatments only by dramatic success stories. Third, it reminds us that suggestion can influence experience without giving one person unlimited control over another.
Finally, wartime history encourages a careful distinction between three different ideas:
Hypnosis as a clinical technique
Suggestion as a psychological influence
Mind control as a sensational claim
The first two have documented roles in medical and psychological history. The third is usually far more dramatic than the evidence allows.
Bottom line
Hypnosis did play a part in World War I and World War II, especially in selected cases involving shell shock, battle exhaustion, functional symptoms, pain, anxiety, and rehabilitation. Its use was limited, inconsistent, and shaped by the medical practices and military pressures of the time.
It was not a universal cure, a replacement for anesthesia, a dependable truth detector, or a reliable way to program assassins. The historical record supports a modest conclusion: hypnosis was one tool among many used by some wartime clinicians, and its significance lies more in the history of military medicine than in stories of secret mind control.
Notes
Allan Young, The Harmony of Illusions: Inventing Post-Traumatic Stress Disorder (Princeton, NJ: Princeton University Press, 1995).
Peter Leese, Shell Shock: Traumatic Neurosis and the British Soldiers of the First World War (New York: Palgrave Macmillan, 2002).
Edgar Jones and Simon Wessely, Shell Shock to PTSD: Military Psychiatry from 1900 to the Gulf (Hove, UK: Psychology Press, 2005).
Ben Shephard, A War of Nerves: Soldiers and Psychiatrists in the Twentieth Century (Cambridge, MA: Harvard University Press, 2001).
Eric T. Carlson, “The History of Military Psychiatry,” in Comprehensive Textbook of Psychiatry, edited by Harold I. Kaplan and Benjamin J. Sadock, 5th ed. (Baltimore: Williams & Wilkins, 1989).
U.S. Army, Neuropsychiatry in World War II, edited by William S. Mullins, vol. 1, Zone of Interior (Washington, DC: Office of the Surgeon General, Department of the Army, 1966).
U.S. Army, Neuropsychiatry in World War II, edited by William S. Mullins, vol. 2, Overseas Theater (Washington, DC: Office of the Surgeon General, Department of the Army, 1973).
Ernest R. Hilgard, Divided Consciousness: Multiple Controls in Human Thought and Action, expanded ed. (New York: Wiley, 1986).
Michael D. Yapko, Suggestions of Abuse: True and False Memories of Childhood Sexual Trauma (New York: Simon & Schuster, 1994).
American Psychological Association, Division 30, Society of Psychological Hypnosis, “The Practice of Clinical Hypnosis,” in Ethical Standards of Psychologists, historical professional guidance on hypnosis and memory.