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2. Essential tremor - Wikipedia

   en.wikipedia.org/wiki/Essential_tremor

   Unlike Parkinson's disease, essential tremor may worsen with action. Essential tremor is a progressive [8] [9] [10] neurological disorder, and the most common movement disorder. Though not life-threatening, it can certainly be debilitating. Its onset is usually between 40 and 50 years of age, but it can occur at any age. [11]

3. Parkinsonism - Wikipedia

   en.wikipedia.org/wiki/Parkinsonism

   Parkinsonism is a clinical syndrome characterized by tremor, bradykinesia (slowed movements), rigidity, and postural instability. [1] [2] Both hypokinetic (bradykinesia and akinesia) as well as hyperkinetic (cogwheel rigidity and tremors at rest) features are displayed by Parkinsonism. [3]

4. DaT scan - Wikipedia

   en.wikipedia.org/wiki/DAT_Scan

   DaTSCAN is indicated in cases of tremor when its origin is uncertain. Although this method can distinguish essential tremor from Parkinson's syndrome, it is unable to distinguish between Parkinson's disease, Dementia with Lewy bodies, Parkinson's disease dementia, [3] multiple system atrophy or progressive supranuclear palsy.

5. Tremor - Wikipedia

   en.wikipedia.org/wiki/Tremor

   Tremors in between these two may be described as medium amplitude. Frequency: A slow tremor makes a motion at a few times per second. A rapid or fast tremor is around 12 Hz or faster. [18] [19] Tremors in between these two speeds may be described as intermediate speed. Affected body parts: For example, the left hand, or both legs, or the voice.

6. Hyperkinesia - Wikipedia

   en.wikipedia.org/wiki/Hyperkinesia

   Tremors are symmetric about a midpoint within the movement, and both portions of the movement occur at the same speed. Unlike the other hyperkinetic movements, tremors lack both the jerking associated movements and posturing. [4] Essential tremor (ET), also known as benign essential tremor, or familial tremor, is the most common movement ...

7. Neurological disorder - Wikipedia

   en.wikipedia.org/wiki/Neurological_disorder

   Movement disorders of the central and peripheral nervous system such as Parkinson's disease, essential tremor, amyotrophic lateral sclerosis (ALS), [failed verification] and Tourette syndrome [failed verification] Sleep disorders (e.g., narcolepsy) Some speech disorders (e.g., stuttering) Headaches (e.g., migraine, cluster headache, tension ...