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If you have essential tremor, you get rhythmic shaking in one part of your body. This is usually in your hands, head or both.

You won't notice the tremor when you're resting or sleeping. The tremor happens when you're in a certain position (such as holding your arms out), or when you try to make a particular movement (such as writing).

You may find it hard to do simple things like hold a cup, write a letter or shave. But essential tremor isn't a normal part of ageing. If you find it distressing, you don't have to put up with it.

The name essential tremor means that you have a tremor, but doctors can't find any definite reason for it. Doctors aren't sure why some people get essential tremor, but it seems to run in families. About half the people who have essential tremor also have a family history of it.¹

This information is for educational use only, and is not a substitute for prompt professional medical advice. Readers should always consult a physician or other professional for advice and treatment. ©BMJ Publishing Group Limited 2008. All rights reserved.