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All about tremor essential tremor familial tremor causes of tremor symptoms of tremors diagnosis of tremors treatment for tremors

What causes a tremor?

Tremor occurs when the muscles relax and contract repeatedly. While most people experience a tremor at some time, usually because of fear or excitement, a number of neurological diseases that destroy nerve tissue cause uncontrollable tremor. These include Parkinson's disease and multiple sclerosis. Other causes include stroke or head injury; Wilson's disease, a hereditary disorder in which toxic levels of copper accumulate in the tissues; mercury poisoning; an over-active

thyroid gland; and liver encephalopathy. Tremor can occur as a side effect of drugs including amphetamines, antidepressants, antipsychotics, caffeine, and lithium, and as a result of withdrawal from alcohol or addictive drugs.

Some types of tremor are signs of an underlying condition. About a million and a half Americans have Parkinson's disease, a disease that destroys nerve cells. Severe shaking is the most apparent symptom of Parkinson's disease. This coarse tremor features four to five muscle movements per second. These movements are evident at rest but decline or disappear during movement. Other disorders that cause tremor are multiple sclerosis, Wilson's disease, mercury poisoning, thyrotoxicosis, and liver encephalopathy. A tremor that gets worse during body movement is called an "intention tremor." This type of tremor is a sign that something is amiss in the cerebellum, a region of the brain concerned chiefly with movement, balance and coordination.

Tremors are classified according to the type of shaking, how often it occurs, and how severe it is. A tremor that gets worse when a person is moving is called an intention tremor. Intention tremors signal a problem in the cerebellum, the part of the brain responsible for movement, balance, and coordination. These usually occur in people with multiple sclerosis, who have had a stroke, or suffer from alcoholism. Essential tremors are a type of tremor that begin in early adulthood and have no known cause. When essential tremors begin in older people, they are called senile tremors. Research has shown that essential tremor is in an inherited condition in over 50 percent of all cases. Children of a parent with essential tremor have a 50% chance of also having this condition. Essential tremors do not indicate any underlying disease. Tremors that occur when the muscles are at rest may be a sign of Parkinson's disease. These types of tremors are called resting tremors or Parkinsonian tremors.

More information on tremor

What is a tremor? - Tremor is an unintentional (involuntary), rhythmical alternating movement that may affect the muscles of any part of the body.
What's essential tremor? - Essential tremor is a nerve disorder characterized by uncontrollable shaking, or tremors, in different parts and on different sides of the body.
What is a familial tremor? - Familial tremor is a neurologic disorder that tends to run in families, involving involuntary shaking (tremors).
What causes a tremor? - Tremor is caused by Parkinson's disease and multiple sclerosis. Other causes include stroke or head injury; Wilson's disease.
What're the symptoms of tremors? - Intention tremors can occur at rest. Essential tremor most commonly affects the head and hands. Parkinsonian tremors occur at rest.
How are tremors diagnosed? - Close attention to where and how the tremor appears can help provide a correct diagnosis of the cause of the shaking.
What is the treatment for tremors? - There is no cure for tremor and, in most cases, there is no need to treat essential tremor. Propranolol is often used to treat severe essential tremor.
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