Why are my hands shaking for no reason? – Hand tremor causes & treatment

What is the meaning of “Tremor”?

Tremor is a medical term that means to-and-fro shaking of a body part. We doctors describe it as a pendulum-like shaking, like the pendulum of a clock (or a metronome).

Metronome
To-&-fro shaking of a body part is called “Tremor”

Other abnormal movements are known. For example, sudden jerks of the body or arms are called myoclonus. Other abnormal movements have names such as dystonia, choreo-athetosis, ballismus etc…

But, by far, the most common abnormal movement is Tremor, as described above. When a person says that he/she has shaking of the hands 9 times out of 10, this shaking is a Tremor. In this article, we will be discussing only about Tremor.

Which diseases can cause tremor?

Similar questions:

  • What are the causes of hand tremor?

  • Why are my hands shaking?

  • Why are my hands trembling?

  • What are the reasons for hand shivering?

  • Why are the causes of finger shivering?

This by far, is the most important question in this article. There are many diseases that can cause tremor. The two most important diseases or types of tremor are Parkinson’s disease and Essential Tremor. There are other types of tremor, such as dystonic tremor and rubral tremor – but let us not discuss these relatively uncommon causes at this point.

  1. Essential tremor: Essential tremor is more common. This is an inherited disorder. In contrast to Parkinson’s disease there is shaking of both sides of the body, usually both hands and sometimes the voice. It increases when you try to do something, especially something which requires fine movements like typing, writing or knitting.
    write 593333 1920
    If your hands shake while writing, then you could have Essential Tremor.

    The shaking caused by essential tremor can increase when you are under stress/anxiety or if you drink too much tea, coffee or caffeinated drinks. There is a peculiar, amusing aspect to essential tremor – It decreases dramatically after you ingest a very moderate quantity of alcohol.

    Whisky
    A small quantity of alcohol can decrease shaking of hands caused by Essential Tremor.

    So, if you have a long standing shaking of both hands that increases when you have to give a speech or presentation, but then almost completely disappears even with a small peg of whisky – you probably have essential tremor.

  2. Parkinson’s Disease: This is a complex disease in which many features are seen.
    In Parkinson’s disease the tremor is more at rest – and is therefore called a resting tremor. But the tremor can also be seen when you try to do some day-to-day movements – e.g. while bringing a glass of water to your mouth.

    RestingHands
    A typical feature of Parkinson’s disease is that the shaking of hands happens at rest, when you are just sitting down and not trying to do anything.

    One absolutely important thing to remember is that the tremor of Parkinson’s disease initially starts only on one side of the body e.g. in one hand. In the later stages, there might be shaking of the other side as well, but even at that stage the shaking is asymmetric – more on one side than the other.

One thing that really helps to differentiate between Parkinson’s disease and Essential tremor is to look for the other symptoms of Parkinson’s disease. Patients with Parkinson’s disease may also have slowness of movements (such as walking slowly, talking slowly), stiffness of limbs (such as not being able to lift the hand up to the head) and other noticeable things – such as decreased swinging of the affected arm while walking, imbalance etc.

But, what process in the brain causes tremor?

It is not known clearly what causes tremor.

There is a very complex circuitry in our brain that controls our movements. The characteristics of the cells that form these connections, and the connections themselves are still being discovered.

VoluntaryMovement
Our movements are controlled by extremely complex circuits in our brain.

The periodic nature of tremor may be due to two reasons (1) Repetitive, regular firing of the cells that are parts of these circuits (2) Reverberating circuits, going round and round these circuits in closed loops.

Although it is not perfectly understood, we do understand certain critical parts of these circuits, for example:

  1. We know that deficiency of dopamine in some of these circuits causes Parkinson’s disease. This deficiency is caused by death of cells that produce dopamine, in a structure called the substantia nigra (“the black substance”)
    SubstantiaNigra5
    Parkinson’s disease is caused by damage to the dopamine-producing cells in the Substantia Nigra.
  2. We know that electrical stimulation of some parts of these circuits (specifically, structures called the “subthalamic nucleus” and “globus pallidus”) can relieve some of the symptoms of Parkinson’s disease. This is called Deep Brain Stimulation (DBS) and you can read more about DBS here.

What medications can be taken for shaking hands?

The medical treatment for controlling the shaking of hands depends on the cause. A wide variety of medications are available to stop uncontrollable shaking of hands.

For example:

  • For essential tremor, medications called “beta-blockers” are very helpful.
  • For Parkinson’s disease, a medication called “levodopa” is very helpful. Levodopa is converted into dopamine inside the brain. There are many, many other medications available for Parkinson’s disease, and it is very important to use these carefully. Using them in the appropriate doses is an art, and requires continued feedback from the patient.
LevodopaToDopamine
After it enters the brain, Levodopa is converted into Dopamine.

Other medications such as “benzodiazepines” may control other tremors – such as orthostatic tremors. Tremors associated with dystonia are best managed with botulinum injections etc.

 

 

Caution: This information is not a substitute for professional care. Do not change your medications/treatment without your doctor's permission.
Dr. Siddharth Kharkar

Dr. Siddharth Kharkar

Dr. Siddharth Kharkar has been recognized as one of the best neurologists in Mumbai by Outlook India magazine and India today Magazine. He is a board certified (American Board of Psychiatry & Neurology certified) Neurologist.

Dr. Siddharth Kharkar is a Epilepsy specialist in Mumbai & Parkinson's specialist in Mumbai, Maharashtra, India.

He has trained in the best institutions in India, US and UK including KEM hospital in Mumbai, Johns Hopkins University in Baltimore, University of California at San Francisco (UCSF), USA & Kings College in London.

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