Tremor - essential; Familial tremor; Tremor - familial; Benign essential tremor; Shaking - essential tremor
Essential tremor (ET) is a type of involuntary shaking movement. It has no identified cause. Involuntary means you shake without trying to do so and are not able to stop the shaking at will.
ET is the most common type of tremor. Everyone has some tremor at times, but the movements are usually so small that they can't be seen. ET affects both men and women. It is most common in people older than 65 years.
The exact cause of ET is unknown. Research suggests that the part of the brain that controls muscle movements does not work correctly in people with ET.
If an ET occurs in more than one member of a family, it is called a familial tremor. This type of ET is passed down through families (inherited). This suggests that genes play a role in its cause.
Familial tremor is usually a dominant trait. This means that you only need to get the gene from one parent to develop the tremor. It often starts in early middle age, but may be seen in people who are older or younger, or even in children.
The tremor is more likely to be noticed in the forearm and hands. The arms, head, eyelids, or other muscles may also be affected. The tremor rarely occurs in the legs or feet. A person with ET may have trouble holding or using small objects such as silverware or a pen.
The shaking most often involves small, rapid movements occurring 4 to 12 times a second.
Specific symptoms may include:
The tremors may:
Your health care provider can make the diagnosis by performing a physical exam and asking about your medical and personal history.
Tests may be needed to rule out other reasons for the tremors such as:
Blood tests and imaging studies (such as a CT scan of the head, brain MRI, and x-rays) are usually normal.
Treatment may not be needed unless the tremors interfere with your daily activities or cause embarrassment.
For tremors made worse by stress, try techniques that help you relax. For tremors of any cause, avoid caffeine and get enough sleep.
For tremors caused or made worse by a medicine, talk to your provider about stopping the medicine, reducing the dosage, or switching. Do not change or stop any medicine on your own.
Severe tremors make it harder to do daily activities. You may need help with these activities. Things that can help include:
MEDICINES FOR TREMOR
Medicines may help relieve symptoms. The most commonly used drugs include:
These drugs can have side effects.
Other medicines that may reduce tremors include:
Botulinum toxin injections may be tried to reduce tremors.
In severe cases, surgery may be tried. This may include:
An ET is not a dangerous problem. But some people find the tremors annoying and embarrassing. In some cases, it may be dramatic enough to interfere with work, writing, eating, or drinking.
Sometimes, the tremors affect the vocal cords, which may lead to speech problems.
Contact your provider if:
Alcoholic beverages in small quantities may decrease tremors. But alcohol use disorder may develop, especially if you have a family history of such problems.
Bhatia KP, Bain P, Bajaj N, et al. Consensus Statement on the classification of tremors. from the task force on tremor of the International Parkinson and Movement Disorder Society. Mov Disord. 2018;33(1):75-87. PMID: 29193359 pubmed.ncbi.nlm.nih.gov/29193359/.
Blomstedt P, Hariz M. Surgical management of tremor. In: Winn HR, ed. Youmans and Winn Neurological Surgery. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 109.
Jankovic J. Parkinson disease and other movement disorders. In: Jankovic J, Maziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 96.
Okun MS, Lang AE. Other movement disorders. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 382.BACK TO TOP
Review Date: 4/25/2022
Reviewed By: Joseph V. Campellone, MD, Department of Neurology, Cooper University Hospital, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Health Content Provider
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2023 A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.