Essential Tremor is a neurological condition that causes repetitive trembling, most often in the hands but sometimes the head, legs, or voice. (It's also called familial or benign essential tremor.) The shaking usually appears during voluntary movement or while holding a position, and it tends to worsen with stress, fatigue, or after caffeine.
The exact cause is still unknown, but several factors are recognized as contributing (Haubenberger & Hallett, New England Journal of Medicine, 2018):
- Genetic and familial — Essential Tremor often runs in families.
- Neurochemical imbalances — abnormalities in neurotransmitters such as dopamine (movement and coordination) and GABA (which dampens nerve signaling) are implicated.
- Brain circuitry — altered activity in the cerebellum, thalamus, and related motor-control pathways.
- Vascular factors — reduced blood flow in certain brain regions may play a role, though the evidence is limited and still being studied.
Triggers vary from person to person, but common ones include (NINDS, Tremor):
- Stress and anxiety — activate the sympathetic nervous system and intensify shaking.
- Fatigue and poor sleep — make it harder for the body to maintain steady motor control.
- Caffeine and stimulants — can amplify tremor; see our guide on caffeine and tremors.
- Temperature extremes — cold can stiffen muscles and heat can bring fatigue and dehydration, both of which can worsen tremor.
- Certain medications — some antidepressants, asthma drugs, and others; ask your provider if you suspect one.
- Specific movements or positions — holding objects at arm's length or fine, precise tasks.
Not all tremors are the same. Clinically, tremors are classified by when they occur — and that timing usually reveals the likely cause.
So if a tremor appears mainly at rest, that points toward a Parkinsonian pattern; a tremor in both hands during use suggests Essential Tremor; and a tremor that worsens as the hand nears a target suggests cerebellar involvement. The pattern tells the story.
When a utensil gets 2 inches from my mouth, my wrist will shake uncontrollably... It's so embarrassing. I have no one to tell.
— Person with essential tremor, r/EssentialTremor
About this quote: a real post from r/EssentialTremor, a Reddit community where people with tremor share experiences — a clear example of an action tremor that worsens on approach to a target.
Beyond type, clinicians measure two features to gauge severity:
- Amplitude — how large the shaking movement is. Larger-amplitude tremors are more visible and more disruptive to tasks.
- Frequency — how many tremor cycles happen per second, in hertz (Hz). Essential Tremor typically ranges 6–12 Hz, and as it progresses the frequency may slow while the amplitude grows (Haubenberger & Hallett, New England Journal of Medicine, 2018).
These measurements guide treatment. Management strategies — physical therapy, medication, and assistive devices — often aim to reduce tremor amplitude and improve stability during tasks.
Because the clinical goal is to reduce amplitude — how far the hand moves during the shake — that's exactly the dimension a wearable device acts on directly. The Steadi-3 Plus is an FDA-registered Class I medical device that uses a passive magnetic vibration absorber (tuned mass damping) to counteract tremor as the hand moves, with no electronics or batteries. Amplitude is exactly what its trial measured: 84% of wearers improved on no device, and 70% improved on a placebo glove (Steadiwear, Steadi-3 Plus validation study). It doesn't change the tremor's frequency or treat its neurological cause — it steadies the hand mechanically during tasks like holding a cup, writing, or buttoning a shirt.
For action tremors that interfere with daily tasks, a tremor glove can lower the amplitude you actually feel in the moment, working alongside medication and therapy rather than replacing them.
Hand tremors are rarely dangerous, but the pattern matters. See a healthcare provider if a tremor is persistent or worsening, appears mainly at rest, worsens as your hand nears a target, or comes with other neurological symptoms — they can identify the type and build a management plan around it.
