Body tremors can stem from a neurological condition, such as Parkinson’s disease, medication use, anxiety, and other causes. Treatments for body tremors and shaking will depend on the cause but may include medication, surgery, and lifestyle remedies.
A body tremor is an involuntary muscle contraction with a rhythmic pattern that causes shaking in one or more body parts.
In some cases, body tremors are due to a dysfunction in the deep areas of the brain that control movement. This type of dysfunction may occur as a result of the following neurological conditions:
- stroke
- traumatic brain injury
- neurodegenerative diseases, such as Parkinson’s disease and multiple sclerosis (MS)
Certain medications may also cause body tremors. Examples include:
- amiodarone
- amphetamines
- asthma medications
- atorvastatin
- caffeine
- carbamazepine
- corticosteroids
- cyclosporine
- epinephrine
- hypoglycemic agents
- some psychotic, neurological disorder, and anti-depressant medications
Some other potential causes of body tremor can
- anxiety
- alcohol misuse or withdrawal
- mercury poisoning
- overactive thyroid or hyperthyroidism
- liver or kidney failure
Medical experts classify body tremors into two categories – resting tremors and action tremors.
Resting tremors
Resting tremors occur in a body part that is relaxed and completely supported by gravity. For example, a person may experience a resting tremor in their hands when the hands are resting on their lap.
Resting tremors typically decrease during voluntary movements.
Action tremors
Action tremors occur during voluntary muscle movements.
There are
- Kinetic tremor: Shaking occurs with any type of voluntary movement.
- Intention tremor: Shaking occurs with target-directed movements, such as touching the nose. The tremor typically worsens as a person draws closer to the target.
- Task-specific tremor: Shaking is only present when performing highly skilled or goal-oriented tasks. For example, a person may experience this tremor when writing, drawing, or speaking.
- Postural tremor: Shaking occurs when trying to maintain a position against gravity, such as when holding the arms outstretched.
- Isometric tremor: Shaking occurs during a voluntary muscle contraction that does not involve movement. For example, a person may experience this tremor when holding a heavy object in a fixed position.
Medical experts have further classified the different categories of body tremors into different types.
The following table summarizes the categories and their associated types.
| Category of body tremor | Type of body tremor |
|---|---|
| Resting | •Parkinsonian tremor •dystonic •rubral tremor |
| Postural | •essential •cerebellar •dystonic •physiologic •drug-induced |
| Kinetic | •essential •classic cerebellar •dystonic •drug-induced |
| Task Specific | Primary writing tremor |
Parkinsonian tremor
Around 70% of people with Parkinson’s disease experience resting tremors.
The characteristic Parkinsonian tremor (PT) is a relatively slow tremor that begins in the fingers.
Doctors sometimes refer to PT as a “pill-rolling tremor” because the motion resembles rolling pills or other small items between the fingers. In time, the tremor may progress to the forearm.
Other symptoms of Parkinson’s disease include:
- slow movements
- muscle rigidity
- instability when standing or keeping balance
Essential tremor
Essential tremors typically occur on both sides of the body, but symptoms are generally more noticeable on the dominant side.
The characteristic feature of an essential tremor is a tremor in the hands and arms during action and sometimes at rest.
Essential tremors may also occur in other parts of the body, including:
- the head
- the vocal cords
- the legs and feet
Cerebellar tremor
A cerebellar tremor
For example, a person may experience this type of tremor when bringing a fork to their mouth.
A cerebellar tremor is low in frequency and high in amplitude. Frequency refers to the speed of the tremor, while amplitude is the degree of movement of the body part.
Dystonic tremors
Dystonic tremors involve involuntary twisting or jerking of the limbs. Certain hand and arm positions may cause the tremors to stop.
Dystonic tremors are rare and typically occur in people who are under 50 years of age.
Physiologic tremor
All people have an asymptomatic physiologic tremor, a high-frequency, low-amplitude tremor that occurs at rest and during movement.
Physiologic tremors typically do not affect a person’s day-to-day activities. However, the following factors may exacerbate this type of tremor:
When diagnosing body tremors, a healthcare professional may use physical and neurological examinations, as well as diagnostic tests.
Physical and neurological exams
The physical examination involves checking
- whether muscle contractions occur at rest or during action
- where the tremor occurs on the body
- whether the tremor is bilateral (on both sides) or unilateral (on one side only)
- tremor frequency and amplitude
When conducting a neurological examination, a healthcare professional will look for the following:
- increased muscle stiffness
- impaired balance
- speech abnormalities
Diagnostic tests
A healthcare professional may also order the following diagnostic tests to determine the cause of body tremors:
- Blood and urine tests: These tests may help rule out certain causes of body tremors, such as:
- medication side effects
- drug interactions
- chronic heavy drinking
- thyroid dysfunction
- Diagnostic imaging tests: An MRI or CT can help detect any brain damage that may be causing the tremors. A positron emission tomography scan (PET) or a SPECT procedure, where a healthcare professional injects a chemical into the vein, is sometimes appropriate if a doctor believes a person may have Parkinson’s disease.
- Electromyogram (EMG): EMG tests record electrical activity in the muscles. A doctor may use it to measure involuntary muscle activity in response to nerve stimulation.
Specific treatments may help to reduce the frequency and severity of body tremors. What treatment a person receives will depend on the cause, type, and severity of their tremor.
Medications
Medications can help to manage body tremors. The table below shows the different classes of drugs a doctor may prescribe for body tremors, along with examples of each.
| Drug Class | Drugs |
|---|---|
| Beta-blockers | •atenolol •metoprolol •nadolol •propranolol •sotalol |
| Anti-seizure medications | •primidone •gabapentin •topiramate |
| Benzodiazepines | •alprazolam •clonazepam |
| Parkinson’s disease medications | •levodopa •carbidopa |
In some cases, doctors
Nonsurgical procedures
In some cases, a healthcare professional may recommend a nonsurgical procedure to help manage body tremors.
Focused ultrasound
The thalamus is the part of the brain that controls movement. Damage or disruption to nerve cells in the thalamus can lead to muscle tremors.
Focused ultrasound delivers a fine beam of ultrasound waves to the dysfunctional nerve cells in the thalamus. This destroys the cells, thereby alleviating a person’s tremors.
Radiofrequency ablation
Radiofrequency ablation uses radio waves to generate an electric current. This current heats the dysfunctional nerve and interrupts its ability to send and receive signals.
Surgery
Surgical interventions that may help to manage body tremors include deep brain stimulation (DBS) and thalamotomy.
Deep brain stimulation
DBS is the
The pulse generator sends an electrical current to the electrodes in the thalamus. The pulse then enters the thalamus, interrupting the tremor.
Thalamotomy
Thalamotomy is a surgical procedure that permanently destroys the problematic part of the thalamus.
Doctors usually reserve this surgery for a particularly severe tremor that has not responded to other treatments. Where possible, doctors will perform radiofrequency ablation as an alternative to thalamotomy.
Lifestyle changes
Some lifestyle changes may alleviate body tremors or help people to manage their condition. Examples include:
- eliminating or reducing tremor-inducing substances, such as caffeine and nicotine
- speech therapy to help manage vocal tremors
- physical therapy to help improve muscle strength, control, and coordination
- occupational therapy to help people carry out their usual day-to-day activities
Body tremors can sometimes signal an underlying medical condition. Anyone who experiences body tremors should see a healthcare professional for a diagnosis and appropriate treatment.
A person who suspects that their tremor is a side effect of medication should raise their concerns with a healthcare professional. Where possible, they may adjust the dose or recommend switching to an alternative medication.
A person should not stop taking medication unless advised to do so by a healthcare professional.
There are many different types of body tremors. The type a person experiences can sometimes indicate the cause.
Sometimes, body tremors are due to an underlying neurological condition, such as stroke, Parkinson’s Disease, or multiple sclerosis. However, they may also be a side effect of medications, anxiety, fatigue, or stimulant use.
A doctor will work to determine the cause and provide appropriate treatments. Correct treatment may reduce the frequency and severity of the tremors.