PTSD can cause tremors, and the connection is more direct than many people realize. In veterans with tremor, PTSD was present at roughly double the expected rate across all age groups studied, making it one of the most common psychiatric diagnoses in that population.1PubMed Central. Conditions Associated with Essential Tremor in Veterans: A Potential Role for Chronic Stress The pathways from trauma to shaking involve the body’s stress-response systems, changes in how the brain coordinates movement, and sometimes a condition called functional tremor that sits at the intersection of neurology and psychiatry.
What the Clinical Evidence Shows
A large study of U.S. veterans found that PTSD and anxiety were the two most common psychiatric disorders among those diagnosed with tremor. The odds ratio for PTSD exceeded 2 across every 15-year age cohort examined, meaning veterans with tremor were at least twice as likely to have PTSD as those without. The association was strongest in younger veterans: PTSD was present in about 38% of those aged 21 to 35 with tremor, falling to 27% in the 51-to-65 group and dropping below 10% only above age 80.1PubMed Central. Conditions Associated with Essential Tremor in Veterans: A Potential Role for Chronic Stress That age pattern matters because it suggests the link is not simply about aging brains developing both conditions independently. Younger adults with PTSD are carrying the association too, at even higher rates.
Case reports flesh out the picture. One well-documented case described a veteran whose tremor was specifically triggered by loud, unexpected noises. Both the patient and the clinicians attributed the shaking to the fear and anxiety produced by sounds reminiscent of combat. The tremor was classified as psychogenic in origin, directly tied to the exaggerated startle reflex that PTSD produces.2PubMed. Noise-induced psychogenic tremor associated with post-traumatic stress disorder This kind of tremor is not faked or imagined. The shaking is real and involuntary; its roots are in the nervous system’s response to perceived threat rather than in a degenerative brain disease.
How the Stress Response Produces Tremors
Your body responds to acute danger through two main systems. The first fires almost instantly, flooding the body with norepinephrine and epinephrine (the “fight or flight” chemicals). The second works more slowly, releasing cortisol to produce broader changes in metabolism, immune function, and alertness. In PTSD, both of these systems can become dysregulated, staying active or reacting too strongly long after the original threat has passed.3PubMed Central. Post traumatic stress disorder associated hypothalamic-pituitary-adrenal axis dysregulation and physical illness
When the fast-acting system dumps norepinephrine into your bloodstream at inappropriate moments, your muscles tense, your heart rate spikes, and you may shake. Most people have experienced a mild version of this: the trembling hands after a near-miss car accident or before public speaking. In PTSD, that same reaction gets triggered by reminders of the trauma, sometimes by stimuli so subtle the person is not consciously aware of them. The shaking is the body gearing up for a fight or an escape that is not actually needed.
Researchers studying trauma responses have also identified a different pattern in some people. Rather than going into pure hyperarousal, some trauma survivors shift into a parasympathetic-dominant state, essentially the body’s “shut down” response, which can include its own set of involuntary physical symptoms including trembling and dissociation. Treatment needs to differentiate between these two patterns because a person frozen in a parasympathetic collapse has a different physiological profile than someone in a hyperarousal state, even though both may be trembling.4Hogrefe Publishing (Zeitschrift für Psychologie). Dissociation Following Traumatic Stress
Functional Tremor and Why It Matters
A large proportion of PTSD-related tremors fall under the umbrella of functional neurological disorder. Functional tremor is actually the most common type of functional movement disorder. What makes it “functional” rather than “structural” is that the brain’s hardware is intact; it is the software, the way brain regions communicate with each other, that has gone wrong.5PubMed. Functional tremor
Neuroimaging studies have shown a consistent pattern in people with functional movement disorders. The cortical and subcortical motor pathways, the circuits that plan and execute voluntary movement, are underactive. At the same time, the limbic system, which processes emotions, shows heightened activity, and the amygdala in particular fires more intensely. The prefrontal regions that normally inhibit unwanted movements and integrate sensory feedback with motor planning are impaired.6Brain. The neuroimaging evidence of brain abnormalities in functional movement disorders In plain terms, the emotional brain is overriding the motor brain. Feelings of threat or anxiety are producing physical movements that the person neither intends nor can easily stop.
Functional tremor has specific clinical features that distinguish it from tremors caused by Parkinson’s disease or essential tremor. It tends to be inconsistent: its frequency and amplitude change, it can be distracted away (if the person is asked to tap a rhythm with the unaffected hand, for instance, the tremor often shifts to match that rhythm or stops), and it does not follow the predictable pattern of neurological tremors. A skilled clinician can often diagnose functional tremor at the bedside without needing expensive imaging, though electromyography and accelerometry are sometimes used for confirmation.5PubMed. Functional tremor
Tremors During Sleep
PTSD does not only produce shaking during waking hours. Research on sleep in people with PTSD has found increased motor activity at night, particularly during REM sleep. PTSD subjects showed a higher percentage of REM sleep epochs with prolonged twitch bursts and were more likely to have periodic limb movements during non-REM sleep.7PubMed. Motor dysfunction during sleep in posttraumatic stress disorder These patterns overlap with what is seen in REM behavior disorder, a condition where people physically act out their dreams. For someone with PTSD, this might mean kicking, jerking, or full-body trembling during nightmares, sometimes forcefully enough to wake a partner.
If you or someone you sleep near has PTSD and you notice unusual nighttime movements, twitching, or limb jerking, this is a recognized feature of the condition, not a separate problem to worry about in isolation. Treating the underlying PTSD often reduces the sleep-related motor symptoms as well, though in some cases a sleep specialist may need to evaluate whether an independent sleep disorder is also contributing.
The Overlap Between Trauma and Dissociation
Tremors in PTSD sometimes occur alongside dissociative symptoms: feeling detached from your body, experiencing the world as unreal, or having gaps in awareness. Research comparing patients with functional neurological symptoms (including tremor) and patients with PTSD found that both groups scored higher than healthy controls on measures of dissociation, both the physical kind (somatoform dissociation, where the body does things the person does not feel in control of) and the psychological kind. PTSD patients reported higher overall symptom severity, and those with functional neurological symptoms who also met criteria for PTSD had experienced more emotional maltreatment in childhood than those without co-occurring PTSD.8BMC Psychiatry. Somatoform dissociation and posttraumatic stress syndrome – two sides of the same medal?
This research points to something that clinicians have long suspected: functional neurological symptoms like tremor and psychiatric conditions like PTSD are not unrelated conditions that happen to co-occur. They share underlying mechanisms, particularly around how the brain processes threat, regulates emotion, and maintains a coherent sense of the body. A person whose tremor shows up during flashbacks or episodes of emotional numbness is likely experiencing a single process expressed in both psychological and physical terms.
When Traumatic Brain Injury Complicates the Picture
Many people who develop PTSD, especially military veterans and survivors of violence or accidents, also sustained a traumatic brain injury during the same event. This combination creates a particularly high risk for movement problems, including tremor. A study of veterans found that TBI and PTSD together showed a synergistic association with subsequent Parkinson’s disease, with odds ratios ranging from about 2.2 to 2.7 when both conditions were present.9PubMed Central. Lifelong Association of Disorders Related to Military Trauma with Subsequent Parkinson’s Disease “Synergistic” means the combined risk was greater than what you would expect by simply adding the two individual risks together. TBI and PTSD amplify each other’s effects on the motor system.
This matters practically because a person with both PTSD and a history of head injury who develops tremor needs careful evaluation. The tremor could be functional (related to the psychological trauma), it could be structural (related to brain damage from the injury), or it could reflect early neurodegeneration that the combination of TBI and PTSD has accelerated. The treatment path differs depending on the cause, so teasing apart these contributions is important even when it is difficult.
Getting the Right Diagnosis
One of the biggest challenges with PTSD-related tremor is that it can look, from the outside, very similar to other types of tremor. Essential tremor, early Parkinson’s disease, medication side effects, thyroid dysfunction, and caffeine or stimulant use can all produce shaking. A doctor evaluating new-onset tremor in someone with PTSD should consider all of these, not just assume the shaking is trauma-related.
That said, functional tremor has some telltale signs that help with bedside diagnosis:
- Distractibility: The tremor changes or stops when the person’s attention is directed elsewhere, such as performing a mental arithmetic task or tapping a rhythm with the opposite hand.
- Entrainment: When asked to make a rhythmic movement with another limb, the tremor’s frequency shifts to match it.
- Variable frequency: Unlike Parkinsonian or essential tremor, which tend to be relatively steady, functional tremor shifts in speed and amplitude over short periods.
- Ballistic suppression: A sudden fast movement of the affected limb briefly suppresses the tremor.
These features can be identified through clinical examination, and a neurologist experienced with functional movement disorders can often reach a confident diagnosis without imaging.5PubMed. Functional tremor The diagnosis itself is therapeutic for many patients: learning that the tremor is real, that it has a name, and that it does not indicate progressive brain disease can reduce the anxiety that often feeds the symptom.
Treatment Approaches That Work
Because PTSD-related tremor typically involves both the psychological trauma and the brain’s abnormal motor output, effective treatment usually addresses both sides. The most direct route is treating the PTSD itself. Evidence-based trauma therapies, including prolonged exposure therapy and cognitive processing therapy, reduce the hyperarousal and emotional dysregulation that drive functional tremor. As the PTSD symptoms improve, the tremor often improves with them.
Physical rehabilitation has emerged as a meaningful part of treatment for functional movement disorders. For a long time, these conditions were treated almost exclusively with psychiatric and psychological interventions, but recent evidence supports including targeted physical therapy in the treatment plan.10PubMed Central. Physical Rehabilitation of Motor Functional Neurological Disorders: A Narrative Review This is not generic strengthening or stretching. Physiotherapy for functional tremor involves specific techniques, including the use of EMG biofeedback, which lets the person see their own muscle activity on a screen and learn to recognize and reduce the patterns that produce the tremor. Consensus recommendations from neurologists and physiotherapists support these approaches as part of a coordinated treatment plan.11Journal of Neurology, Neurosurgery & Psychiatry. Physiotherapy for functional motor disorders: a consensus recommendation
Some medications used to treat PTSD can also help with the physical symptoms. Beta-blockers like propranolol, which dampen the body’s adrenaline response, have shown promise. In a study of over 200 patients with anxiety-related disorders or PTSD, those treated with propranolol showed significant reductions in heart rate, blood pressure, and respiratory rate alongside improvements in anxiety and PTSD symptom scores compared to those receiving conventional treatment alone.12PubMed. Evaluation of the Efficacy of Propranolol in the Treatment of Patients with Anxiety and Post-traumatic Stress Disorder Beta-blockers have been used for decades to control performance-related tremor (the shaking hands before a speech), and their ability to reduce both the psychological and physiological components of PTSD-related arousal makes them a reasonable option for tremor that rides on top of chronic hyperarousal.
It is worth noting, however, that some medications commonly prescribed for PTSD, particularly certain antidepressants, can themselves cause tremor as a side effect. SSRIs and SNRIs list tremor among their known adverse effects. If tremor appears or worsens after starting a new medication, the timing is important information for your prescriber. The fix may be a dose adjustment or a switch to a different drug rather than adding another medication on top.
Neurogenic Tremor as a Therapeutic Tool
In a somewhat counterintuitive twist, some practitioners deliberately induce tremor as a treatment for PTSD. Tension and Trauma Release Exercises, or TRE, are a sequence of seven exercises designed to trigger what is called neurogenic tremor, essentially controlled shaking of the large muscle groups. The theory is that the body stores tension from trauma in the muscles and that allowing the body to shake it out can reduce PTSD and stress-related symptoms.13Psychological Counseling and Psychotherapy. Neurogenic tremor through TRE Tension, Stress and Trauma Releasing Exercises according to D. Berceli in the treatment of post-traumatic stress disorder PTSD
The evidence base for TRE is still developing. Randomized controlled trials are being designed to test its effectiveness more rigorously, including protocols that would evaluate TRE as an add-on to standard treatment for adolescents with emotional disorders.14PubMed Central. Study protocol for a randomized controlled trial evaluating the effectiveness of a mother-child intervention model of neurogenic tremor as an add-on to treatment for emotional disorders in adolescents Some clinicians and patients report benefit, but the evidence is thinner than for established PTSD therapies. If you are interested in TRE, it is reasonable to try it alongside evidence-based treatment rather than as a replacement for it.
The Animal Research That Shaped Our Understanding
Much of what we understand about the biology connecting trauma and physical symptoms comes from animal studies on inescapable stress. Researchers noticed decades ago that animals subjected to shocks they could not avoid developed a striking set of behavioral changes that parallel what happens in people with PTSD: initial depletion of the brain chemicals (catecholamines) that regulate arousal and movement, followed by long-term changes in how the stress system responds. The numbing and “frozen” reactions seen after severe trauma in humans were proposed to correspond to this catecholamine depletion.15Elsevier / Biological Psychiatry. Inescapable shock, neurotransmitters, and addiction to trauma: Toward a psychobiology of post traumatic stress
This line of research helped establish that PTSD is not a purely psychological condition. The “physioneurosis” label used by early researchers captured the idea that both the mind and the body’s chemical systems are altered. Tremor, in this framework, is not a mysterious add-on symptom. It is a direct consequence of a nervous system whose threat-response chemistry has been fundamentally changed by trauma, producing physical outputs (shaking, startle, muscle tension) even in the absence of any current danger. Understanding this helps take the stigma out of PTSD-related tremor: the body is not malfunctioning randomly, and the person is not “making it up.” The shaking is the predictable physical expression of a nervous system that learned, through overwhelming experience, to stay on high alert.