![]() ![]() An altered gene from just one parent is needed to pass on the condition.Īnyone who has a parent with an altered gene for essential tremor has a 50% chance of developing the condition. The inherited variety of essential tremor, known as familial tremor, is an autosomal dominant disorder. Known risk factors for essential tremor include:Īltered gene. The person has a 50% chance of having an unaffected child. A person with an autosomal dominant disorder - in this example, the father - has a 50% chance of having an affected child with one changed gene. You need only one changed gene to be affected by this type of disorder. It's located on one of the nonsex chromosomes, called autosomes. In an autosomal dominant disorder, the changed gene is a dominant gene. Parkinson's disease tremors usually start in the hands, and can affect the legs, chin and other parts of the body. Essential tremor mainly involves the hands, head and voice. However, people with essential tremor sometimes develop other neurological signs and symptoms, such as an unsteady walk. Essential tremor doesn't cause other health problems, but Parkinson's disease is associated with stooped posture, slow movement and dragging the feet when walking. ![]() Tremors from Parkinson's disease are most noticeable when the hands are at the sides of the body or resting in the lap. Essential tremor of the hands usually occurs when using the hands. Many people associate tremors with Parkinson's disease, but the two conditions differ in key ways: ![]() May be aggravated by emotional stress, fatigue, caffeine or temperature extremes.Can include a "yes-yes" or "no-no" motion of the head.Usually occur in the hands first, affecting one hand or both hands.Begin gradually, and usually are more noticeable on one side of the body. ![]()
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