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Muscle tremors are involuntary movements of the body, which can occur in any part of the body and at any time. They are usually caused by a problem in the cerebellum, the part of the brain that controls muscular movement. Tremors can be normal, and they can happen at any age, though they are more common in older people. Tremors can be caused by lifestyle factors such as caffeine consumption, alcohol use disorder, or medical conditions such as stroke, Parkinson's disease, or multiple sclerosis. While most tremors go away on their own, some can be treated with medication or surgery.
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What You'll Learn
Causes of muscle tremors
Muscle tremors can be caused by a variety of factors, ranging from lifestyle choices to medical conditions. Here are some of the most common causes of muscle tremors:
Lifestyle Factors
Lifestyle choices that can contribute to muscle tremors include consuming too much caffeine, smoking, and a lack of quality sleep.
Neurological Disorders
Neurological disorders such as Parkinson's disease, multiple sclerosis, stroke, and traumatic brain injuries are often associated with muscle tremors. Parkinsonian tremor, for example, is a common early sign of Parkinson's disease, typically affecting the hands at rest and progressing to other limbs.
Medications
Certain medications can induce muscle tremors as a side effect. This includes asthma medications, corticosteroids, chemotherapy drugs, and some psychiatric and neurological medications.
Dystonia
Dystonic tremor is associated with dystonia, a movement disorder characterised by involuntary muscle contractions. This can lead to twisting and repetitive movements or abnormal postures, commonly affecting the neck, vocal cords, or arms and legs.
Cerebellar Damage
Damage to the cerebellum and its pathways, often caused by stroke, brain tumours, multiple sclerosis, or long-term alcohol use, can result in cerebellar tremor. This type of tremor typically affects the arms, legs, hands, or feet and worsens at the end of a purposeful movement.
Orthostatic Tremor
Orthostatic tremor is a rare disorder characterised by rapid muscle contractions in the legs when standing up. The cause of this type of tremor is unknown, but it usually stops when the person sits down or walks.
Stress, Fatigue, and Emotions
Strong emotions such as stress, fear, or anger can exacerbate muscle tremors.
It is important to note that muscle tremors can occur in anyone at any age, but they are more common in middle-aged and older adults. If you are experiencing persistent or severe muscle tremors, it is advisable to consult a healthcare professional for a proper diagnosis and treatment plan.
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Types of muscle tremors
Muscle tremors are categorised as rest and action tremors. Rest tremors occur when a person is at rest, and action tremors occur when a muscle is moved voluntarily. Here are some of the types of muscle tremors:
Rest Tremor
People with Parkinson's disease often experience this type of tremor, which is most noticeable when the hands are at rest and may look like someone is trying to roll a small item between the thumb and finger. It may also affect the chin, lips, face, and legs. This type of tremor may initially appear in only one limb or just on one side of the body but can spread to both sides as the disease progresses.
Action Tremor
Action tremors have several sub-classifications, including:
- Postural tremor: This occurs when holding a position against gravity, such as keeping the arms outstretched.
- Kinetic tremor: This is associated with any voluntary movement, such as moving the wrists up and down or closing and opening the eyes.
- Intention tremor: This starts when a person makes an intended movement toward a target, such as lifting a finger to touch their nose.
- Task-specific tremor: This appears only when performing goal-oriented tasks such as handwriting or speaking.
- Isometric tremor: This occurs during a voluntary muscle contraction that is not accompanied by any movement, such as holding a heavy book in the same position.
Other Types of Tremors
In addition to rest and action tremors, there are a few other types of tremors:
- Dystonic tremor: This occurs in people with dystonia, a movement disorder characterised by involuntary muscle contractions that result in twisting and repetitive movements. It can affect any muscle in the body.
- Orthostatic tremor: This rare disorder involves rapid muscle contractions in the legs when a person stands up. The tremor usually stops when the person sits down or walks.
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Muscle tremor diagnosis
Muscle tremors are usually diagnosed through a physical exam and a neurological exam. Doctors will also review the patient's medical history and test muscle tone and strength, reflexes, balance, and speech. The doctor will also evaluate:
- Whether the tremor occurs when the muscles are at rest or in action.
- The location of the tremor in the body (and if it occurs on one or both sides).
- The appearance of the tremor (tremor frequency and amplitude/size).
- Blood or urine samples may be taken to rule out certain contributing factors, such as thyroid disease.
- Diagnostic imaging may be used to determine if the tremor is the result of damage to the brain.
- An electromyogram (EMG) may be ordered to measure involuntary muscle activity and the muscle's response to nerve stimulation.
- Additional tests can help determine any functional limitations, such as difficulty with handwriting or the ability to hold a fork or cup.
Tremors are usually the result of a problem in the cerebellum, the part of the brain that controls muscular movement. They can also be caused by lifestyle factors, such as consuming too much caffeine, or by medical conditions such as stroke, Parkinson's disease, multiple sclerosis, or brain damage. Tremors are not always serious, but they may sometimes indicate a serious disorder. They can occur in any part of the body and at any time.
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Muscle tremor treatment
Muscle tremors can be a normal part of life. Everyone has some tremor when they move their hands, and factors such as stress, fatigue, anger, fear, caffeine, and smoking may make this type of tremor worse. However, if a tremor does not go away over time, it may be a sign of a medical problem and should be checked by a healthcare provider.
Tremors can occur on their own or be a symptom of other neurological disorders such as Parkinson's disease, multiple sclerosis, or stroke. They can also be caused by certain medications, such as asthma medications, corticosteroids, chemotherapy, and psychiatric and neurological drugs. If you start experiencing tremors that you can't explain, it's important to see a healthcare provider. They will perform a physical exam, including a detailed brain and nervous system (neurologic) exam, and may recommend treatment depending on the cause.
There are several treatment options for muscle tremors, including:
- Medications: Beta-blockers, antiseizure medications, tranquilizers, and other medicines can be prescribed to help relieve symptoms.
- Peripheral nerve stimulation (PNS): This uses a device, including tiny implants and non-invasive options, to target the source of the tremor and relieve symptoms.
- Botox injections: Botox can be injected into various muscle groups, including the neck, arms, or hands, to help treat muscle tremors.
- Deep brain stimulation (DBS): This involves inserting an electrical probe into the portion of the brain responsible for the tremors. A wire is then fed under the skin to a device in the chest, which sends pulses to the probe to stop the brain from producing tremors.
- Focused ultrasound: This procedure uses ultra-high-frequency sound waves focused on a single point in the brain involved in producing the tremor, destroying the targeted tissue and reducing the severity of the tremor.
- Physical therapy: This can help strengthen muscles and improve coordination, potentially relieving tremors.
- Adaptive devices: Using heavier utensils, wrist weights, straws, or heavier bracelets or watches may help relieve tremors.
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Muscle tremor prevention
Muscle tremors are involuntary, uncontrollable movements that can occur in any part of the body. While they can occur at any age, they are more common in older people. Tremors are usually caused by a problem in the cerebellum, the part of the brain that controls muscular movement. They can be triggered by lifestyle factors such as caffeine, smoking, stress, fatigue, anger, and fear, or they can be the result of an underlying medical condition.
To prevent muscle tremors, it is important to address the underlying causes and risk factors. Here are some strategies for muscle tremor prevention:
- Reduce lifestyle triggers: Limit or avoid caffeine and smoking, as these substances can exacerbate tremors. Additionally, manage stress, fatigue, anger, and fear, as these emotional and physical states can trigger or worsen tremors.
- Address medical conditions: Certain medical conditions, such as Parkinson's disease, multiple sclerosis, stroke, and dystonia, can cause or contribute to muscle tremors. Seek medical advice and treatment for these conditions.
- Review medications: Several drugs, including certain asthma medications, corticosteroids, chemotherapy, and psychiatric and neurological medications, can cause tremors. Consult your healthcare provider to review your medications and discuss alternative options if necessary.
- Physical therapy and adaptive devices: Physical therapy can help strengthen muscles and improve coordination, which may reduce tremors. Additionally, using adaptive devices, such as wrist weights and heavier utensils, can provide relief from tremors.
- Botulinum Toxin (Botox) injections: Botox injections can be used to treat muscle tremors, particularly those affecting the face, head, neck, arms, or hands. Botox injections help to relax the muscles and reduce trembling.
- Deep Brain Stimulation (DBS): For severe and debilitating tremors, DBS may be an option. This surgical procedure involves inserting an electrical probe into the portion of the brain responsible for the tremors. A small device is implanted in the chest, sending pulses to the probe to stop the brain from producing tremors.
It is important to consult a healthcare professional for personalized advice and to determine the most appropriate treatment or prevention strategies for muscle tremors.
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Frequently asked questions
Muscle tremors can occur at any age and are more common in older people. They are usually the result of a problem in the cerebellum, the part of the brain that controls muscular movement. Tremors can be normal, but they can also be a sign of an underlying medical condition.
Tremors are categorised based on when and how they are activated. The two main types are rest and action tremors. Rest tremors occur when a person is at rest, while action tremors occur during the movement of the affected body part. Action tremors are further divided into several sub-classifications, including postural, intention, task-specific, kinetic, and isometric tremors.
Muscle tremors can be caused by various factors, including lifestyle factors such as caffeine consumption, alcohol use disorder, fatigue, stress, and certain medications. They can also be caused by underlying medical conditions, such as neurological disorders like Parkinson's disease, multiple sclerosis, stroke, or traumatic brain injury.
The treatment for muscle tremors depends on the underlying cause. In some cases, mild symptoms may not require any treatment. Medications, Botox injections, and surgery (such as deep brain stimulation) are common treatment options. Physical therapy and the use of adaptive devices can also help relieve tremors.
