Quick answer. Essential tremor is a common nervous-system condition that causes rhythmic shaking, usually of the hands, that is worse during movement such as writing or holding a cup. It is not Parkinson’s disease, and although it can be a nuisance, medication and sometimes procedures can reduce the shaking.
Essential tremor is one of the most common movement disorders. It causes rhythmic shaking – most often of the hands, but sometimes the head, voice or other parts of the body. A key feature is that the tremor appears or worsens during action, such as reaching for a cup, writing or holding a spoon, rather than when the hand is resting in your lap. It often runs in families and tends to become more noticeable with age.
A frequent worry for people in Singapore who develop a tremor is whether it means Parkinson’s disease. In most cases it does not: essential tremor and Parkinson’s are different conditions, and a neurologist can usually tell them apart. While essential tremor cannot always be cured, it is not dangerous in itself, and several treatments – from medication to, in selected cases, procedures – can meaningfully reduce the shaking and help with daily tasks.
At a glance
| Feature | Essential tremor | Parkinson's tremor |
|---|---|---|
| When the shaking happens | During action – writing, holding, reaching | Mainly at rest, settling with movement |
| Parts affected | Hands, often head and voice | Usually starts in one hand, can affect a leg |
| Other symptoms | Tremor is the main problem | Slowness, stiffness, shuffling walk over time |
| Family history | Often runs in families | Less commonly familial |
| Effect of alcohol | Often briefly reduces the tremor | No typical improvement |
What is essential tremor?
Essential tremor is a neurological (nervous-system) condition that produces an involuntary, rhythmic shaking. It most commonly affects the hands but can also involve the head (causing a yes-yes or no-no movement), the voice (making it sound shaky), and occasionally the legs. Its defining characteristic is that it is an action tremor – it shows up when you use the affected part, such as when writing, eating or holding something, and tends to ease when the limb is fully at rest.
It is very common, becomes more frequent with age, and often runs in families. Importantly, essential tremor is not Parkinson’s disease. While both cause shaking, they differ in their pattern and in the other symptoms they produce, and a neurologist can usually distinguish them. Essential tremor is not life-threatening, but it can interfere with everyday tasks and confidence, which is why people seek help.
Symptoms & signs
The hallmark of essential tremor is shaking that worsens with movement and purposeful action. Features include:
- Trembling of the hands when reaching, writing, holding a cup or using utensils
- Shaky handwriting that becomes difficult to read
- A nodding or side-to-side tremor of the head
- A quavering or shaky-sounding voice
- Tremor that worsens with stress, tiredness, caffeine or hunger
- Tremor that is often briefly reduced by a small amount of alcohol (though alcohol is not a treatment)
- Shaking that usually affects both sides, though it may be a little worse on one
The tremor typically develops gradually and may stay mild for years, or slowly become more pronounced over time.
Causes & risk factors
The precise cause of essential tremor is not fully understood, but it is thought to involve the brain regions that coordinate movement. Recognised factors include:
- Family history – essential tremor frequently runs in families, and having an affected parent raises the chance of developing it
- Age – it becomes more common as people get older, though it can begin earlier
- Triggers that worsen it – stress, anxiety, tiredness, caffeine and certain medicines can make the tremor more noticeable, though they do not cause the underlying condition
Essential tremor is distinct from a simple physiological tremor (the fine shake everyone has, made worse by caffeine, stress or tiredness) and from Parkinson’s disease. Part of the assessment is making sure the tremor is not due to another cause, such as an overactive thyroid or a medicine side effect.
How it's diagnosed
There is no single test for essential tremor; the diagnosis is made by a neurologist based on the pattern of the tremor and by ruling out other causes. The assessment may include:
- A detailed history and examination – watching the tremor at rest, with the arms outstretched, and during actions such as touching finger to nose or drawing a spiral; this helps distinguish it from Parkinson’s, where the tremor is mainly at rest
- Blood tests – for example checking thyroid function, since an overactive thyroid can cause shaking
- Medication review – some drugs can cause or worsen tremor
- Brain imaging or specialised scans – occasionally used if the diagnosis is unclear or to help separate it from Parkinson’s
Distinguishing essential tremor from Parkinson’s is a central part of the assessment, because their treatment and outlook differ.
Treatment options
Treatment is offered when the tremor interferes with daily life; mild tremor that does not trouble you may simply be monitored. Options include:
- Medication – certain medicines, including some beta-blockers and anti-seizure drugs, can reduce the tremor in many people; the right choice depends on your health and other conditions
- Lifestyle adjustments – reducing caffeine, managing stress and getting enough rest can lessen how noticeable the tremor is; weighted utensils and other aids can help with daily tasks
- Procedures for severe tremor – when the tremor is disabling and does not respond to medication, options such as deep brain stimulation or focused ultrasound may be considered in selected people
Because essential tremor and Parkinson’s are treated differently, an accurate diagnosis is the first step to the right treatment. This guide does not quote prices, as treatment varies by individual.
When to see a doctor & which specialist
See a doctor if a tremor is interfering with writing, eating, drinking, work or confidence, if it is getting worse, or if you are simply worried about what it means – including whether it could be Parkinson’s. A clear diagnosis is reassuring in itself and opens the door to treatment.
You should seek prompt medical assessment if a tremor comes on suddenly, is accompanied by other new neurological symptoms such as weakness, numbness, difficulty speaking or walking, slowness and stiffness of movement, or follows a head injury. If shaking occurs alongside sudden face drooping, arm weakness or slurred speech, treat it as a possible stroke and call 995 immediately. These features are not typical of simple essential tremor and need urgent attention.
The specialist who diagnoses and treats essential tremor, and who can distinguish it from Parkinson’s disease, is a neurologist (brain and nerve specialist). You can find one through our directory of neurologists in Singapore.
Related guides
- Best Neurology Clinics in Singapore — our editorial shortlist
- neurology clinics directory
- Keratoconus
- Ptosis (droopy eyelid)
- Mitral valve prolapse
- Sarcoidosis
- Pulmonary fibrosis
Sources
- NHS – Tremor or shaking hands
- Mayo Clinic – Essential tremor
- SingHealth – Conditions and treatments
- HealthHub Singapore – Brain and nerve health
Part of our Brain & nerves guides · Browse all health topics