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  2. Essential tremor - Wikipedia

    en.wikipedia.org/wiki/Essential_tremor

    Essential tremor (ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations (oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. [ 6 ] It is typically symmetrical, and affects the arms ...

  3. Tremor - Wikipedia

    en.wikipedia.org/wiki/Tremor

    Tremor can also be caused by lack of sleep, lack of vitamins, or increased stress. [11] [12] Deficiencies of magnesium and thiamine [13] have also been known to cause tremor or shaking, which resolves when the deficiency is corrected. [14] Tremors in animals can also be caused by some spider bites, e.g. the redback spider of Australia. [15]

  4. Parkinson's disease - Wikipedia

    en.wikipedia.org/wiki/Parkinson's_disease

    Parkinson's disease (PD), or simply Parkinson's, is a neurodegenerative disease of mainly the central nervous system that affects both the motor and non-motor systems of the body. The symptoms usually emerge slowly, and, as the disease progresses, non-motor symptoms become more common. Usual symptoms include tremors, slowness of movement ...

  5. 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] These are the four motor symptoms found in Parkinson's ...

  6. Signs and symptoms of Parkinson's disease - Wikipedia

    en.wikipedia.org/wiki/Signs_and_symptoms_of...

    Four motor signs are considered cardinal in PD: tremor, rigidity, bradykinesia, and postural instability (also referred to as parkinsonism). [1] Tremor is the most apparent and well-known sign. [1] It is also the most common; though around 30% of individuals with PD do not have tremor at disease onset, most develop it as the disease progresses. [1]

  7. Intention tremor - Wikipedia

    en.wikipedia.org/wiki/Intention_tremor

    Specialty. Neurology. Intention tremor is a dyskinetic disorder characterized by a broad, coarse, and low-frequency (below 5 Hz) tremor evident during deliberate and visually-guided movement (hence the name intention tremor). An intention tremor is usually perpendicular to the direction of movement. When experiencing an intention tremor, one ...

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