Tremor: Why You Shake and What to Do About It
A tremor is a rhythmic, unwanted shaking of part of your body, most often the hands, though it can also affect the head, voice, or legs. Most tremors are not dangerous and many can be managed well once you know the cause. This page explains what a tremor feels like, what can cause one, the warning signs that need fast care, how to get relief, and how to find the right specialist near you.
At a Glance
What a Tremor Is and How It Feels
A tremor is an involuntary, rhythmic back-and-forth movement of one or more parts of your body. It happens when muscles tighten and release in rapid cycles, outside your control. The hands are the most common spot, but a tremor can also affect your head, jaw, voice, trunk, or legs.
Doctors describe tremors by when they show up:
- Resting tremor: shaking that appears when the body part is relaxed and supported, such as a hand trembling in your lap. This pattern is often linked to Parkinson's disease.
- Action tremor: shaking that appears when you move or hold a position. This includes a postural tremor (holding your arms out in front of you) and an intention tremor (shaking that gets worse as your hand nears a target, like touching your nose).
Many people first notice a tremor while writing, holding a cup, using a fork, or threading a needle. It often gets worse with stress, tiredness, caffeine, hunger, or strong emotion, and may calm down when you rest or relax. A mild, brief tremor when you are nervous, cold, or have had too much coffee is normal and usually harmless. A tremor that sticks around, gets worse, or interferes with daily tasks is worth checking out.
Common Causes of a Tremor
A tremor is a symptom, not a diagnosis, and it can come from many different sources. Some causes are simple and reversible; others point to a condition in the nervous system.
Everyday and reversible causes
- Too much caffeine or stimulants, including energy drinks and some asthma or decongestant medicines.
- Stress, anxiety, or lack of sleep, which can amplify the tiny tremor everyone has.
- Low blood sugar, common if you skip meals or take diabetes medicine.
- Alcohol withdrawal in people who drink heavily.
- An overactive thyroid (hyperthyroidism), which speeds up the body and can cause a fine, fast hand tremor.
- Side effects of medicine, such as certain antidepressants, seizure drugs, lithium, or steroids.
Essential tremor
Essential tremor is the most common tremor disorder. It usually affects both hands during action, like writing or lifting a cup, and often runs in families. It is not the same as Parkinson's disease and is generally not dangerous, though it can be frustrating. It tends to get slowly worse over years and sometimes eases briefly with a small amount of alcohol, which is a clue but not a treatment.
Neurological conditions
When a tremor is tied to a disease of the brain or nerves, the cause may be one of these:
- Parkinson's disease, which classically causes a resting tremor, often starting on one side, along with stiffness and slow movement.
- Multiple sclerosis, which can cause an intention tremor and trouble with coordination.
- Dystonia, where muscle pulling and tremor happen together.
- Stroke or a brain injury that affects movement control.
- Huntington's disease and progressive supranuclear palsy, less common movement disorders.
- Lewy body dementia and Alzheimer's disease, which can include parkinson-like shaking.
- Peripheral neuropathy and peripheral neuropathy in the feet, where nerve damage affects steady movement.
- Inherited conditions such as Friedreich ataxia, Charcot-Marie-Tooth disease, and ataxia telangiectasia.
Because the list is long, the pattern of your tremor, your age, and your other symptoms help a doctor narrow it down quickly.
When to Seek Emergency or Urgent Care
Most tremors build up slowly and are not emergencies. But shaking that comes on suddenly or arrives with certain other symptoms can signal a stroke, a serious infection, or a dangerous metabolic problem.
Call 911 or go to the emergency room now if a tremor or new shaking comes with any of these:
- Sudden weakness or numbness in the face, arm, or leg, especially on one side
- Slurred speech, trouble understanding others, or a drooping face
- Sudden confusion, severe headache, or loss of consciousness
- A stiff neck with fever, which can point to brain infection like encephalitis
- Whole-body shaking with loss of awareness, which may be a seizure linked to epilepsy
- Shaking with a very fast heartbeat, heavy sweating, and feeling faint, which can mean very low blood sugar or alcohol withdrawal
Seek same-day or urgent care if you have:
- A tremor that started suddenly over hours or days for no clear reason
- Shaking that quickly spreads or gets much worse
- A tremor with trouble walking, frequent falls, or severe dizziness
- New shaking after starting or changing a medicine
When in doubt, it is always safer to be checked. Time matters most with stroke, where fast treatment can protect the brain.
Getting Relief and Self-Care You Can Try
Once a doctor rules out anything dangerous, several steps can lessen a tremor and make daily life easier. Some are simple habit changes you can start today.
Habits that help
- Cut back on caffeine from coffee, tea, soda, and energy drinks, since stimulants make most tremors worse.
- Sleep well and manage stress, because tiredness and anxiety amplify shaking. Slow breathing or short rest breaks can settle a flare.
- Eat regular meals to keep blood sugar steady.
- Limit alcohol, even though a small amount briefly eases essential tremor, because relying on it can backfire.
- Review your medicines with a pharmacist or doctor to spot any that could be the trigger. Do not stop a prescription on your own.
Practical tools
- Use weighted utensils, cups with lids, and wide-grip pens to steady your hands.
- Brace your elbow on a table when writing or eating.
- Try voice-to-text and large-button devices if handwriting is hard.
Medical treatments
For essential tremor, doctors often prescribe beta blockers such as propranolol, which can noticeably calm the shaking, or the seizure medicine primidone. For a tremor from Parkinson's disease, treatment focuses on the underlying condition with dopamine-based medicines. When tremor is severe and does not respond to pills, options like deep brain stimulation or focused ultrasound may help. The right treatment depends entirely on the cause, which is why a clear diagnosis comes first.
How a Tremor Is Diagnosed
There is no single test for a tremor. A doctor pieces together the cause from your story and a hands-on exam.
Expect questions about when the shaking started, which body parts it affects, whether it happens at rest or during movement, and what makes it better or worse. Your doctor will also ask about your family history and every medicine and supplement you take. During the exam, the doctor may ask you to hold your arms out, touch your nose, draw a spiral, pour water, or write a sentence. These tasks reveal whether the tremor is a resting, postural, or intention type, which is one of the biggest clues to the cause.
Depending on what they find, your doctor may order:
- Blood tests to check thyroid function, blood sugar, and other levels.
- A review of your medicines to rule out a drug side effect.
- Brain imaging such as an MRI if a structural problem or stroke is a concern.
- A DaTscan, a special imaging test that can help tell Parkinson's disease apart from essential tremor.
Many people get a clear answer from the history and exam alone, and not everyone needs imaging. The goal is to separate the harmless or reversible causes from the conditions that benefit from ongoing care.
When to See a Doctor and Which Specialist
See a doctor if a tremor lasts more than a couple of weeks, gets worse over time, or interferes with eating, writing, dressing, or work. Any tremor that comes with stiffness, balance trouble, or changes in your handwriting also deserves attention. A new tremor in an older adult always deserves a checkup, since it can be the first sign of a treatable condition.
Your primary care doctor is a good starting point. They can check for thyroid problems, low blood sugar, and medication causes, and treat many simple cases. When the cause seems neurological, the right specialist is a neurologist, ideally one who focuses on movement disorders. These doctors diagnose essential tremor, Parkinson's disease, and related conditions, and can offer advanced treatments like deep brain stimulation.
You can find board-certified neurologists across the country, including in California, New York, Texas, Florida, and New Jersey, using the specialist finder on this page to connect with care near you.
This page is educational and not a substitute for a medical diagnosis. A tremor has many possible causes, and only an in-person evaluation can tell you which one is yours and what to do about it.
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Frequently Asked Questions
Common questions about tremor
What causes a hand tremor?
A hand tremor can come from everyday triggers like too much caffeine, stress, low blood sugar, or certain medicines. The most common ongoing cause is essential tremor, a usually harmless condition that often runs in families. A resting hand tremor, especially on one side, can also be an early sign of Parkinson's disease, so a lasting or worsening tremor should be checked.
Do beta blockers help essential tremor?
Yes. Beta blockers such as propranolol are a first-choice medicine for essential tremor and can noticeably reduce the shaking for many people. They work best for action tremors in the hands. They are not right for everyone, so a doctor will check your heart rate, blood pressure, and other health conditions before prescribing one.
Is a tremor the same as Parkinson's disease?
No. Most tremors are not Parkinson's disease. Essential tremor, the most common tremor disorder, usually happens during movement and often affects both hands, while Parkinson's tremor typically appears at rest, often starts on one side, and comes with stiffness and slow movement. A neurologist can tell them apart through an exam and sometimes imaging.
When should I worry about a tremor?
Call 911 or go to the emergency room if shaking comes on suddenly with weakness, slurred speech, facial drooping, confusion, or a severe headache, since these can signal a stroke. A stiff neck with fever, or whole-body shaking with loss of awareness, also needs urgent care. A slow, steady tremor without these signs is usually not an emergency but still deserves a checkup.
What does an intention tremor mean?
An intention tremor is shaking that gets worse as your hand approaches a target, such as when you reach to touch your nose or pick up a cup. It points to a problem in the part of the brain that controls coordination, called the cerebellum, and can be seen in conditions like multiple sclerosis or after a stroke. It is worth having a neurologist evaluate this pattern.
Can stress or caffeine cause a tremor?
Yes. Stress, anxiety, lack of sleep, and stimulants like caffeine can make the tiny tremor everyone has more noticeable, producing a fine, fast shaking in the hands. This kind of tremor usually fades once you rest, calm down, or cut back on caffeine. If shaking continues even when you are relaxed and well rested, see a doctor.
How is a tremor diagnosed?
There is no single test. A doctor diagnoses a tremor by asking when and how it happens, watching you hold your arms out, draw a spiral, or write, and reviewing your medicines. They may order blood tests for thyroid and blood sugar, and sometimes brain imaging like an MRI or a DaTscan to separate essential tremor from Parkinson's disease.
Medical disclaimer: This content is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. If you have a medical emergency, call 911. Our editorial standards