Editing Tremor (section)

===Categories===
Tremors are assessed according to amplitude, frequency, affected body parts, and the position or activity in which the tremor manifests.<ref name=":1">{{Cite book |last1=Dover |first1=Anna R. |url=https://books.google.com/books?id=m3iiEAAAQBAJ&pg=PA153 |title=Macleod's Clinical Examination |last2=Innes |first2=J. Alastair |last3=Fairhurst |first3=Karen |date=2023-04-20 |publisher=Elsevier Health Sciences |isbn=978-0-323-84772-8 |pages=153 |language=en}}</ref>  The combination of these four factors indicates likely diagnoses.  For example, early Parkinson's first tends to manifest as a slow tremor in one hand while resting and disappears during intentional movements, but essential tremor appears symmetrically, during intentional movements and disappears while resting.<ref name=":1" />

* [[Amplitude]]:  A '''fine tremor''' is very small or barely noticeable movement; a '''coarse tremor''' is a large movement.  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.<ref name=":1" /><ref>{{Cite book |last1=Grimaldi |first1=Giuliana |url=https://books.google.com/books?id=cWreEAAAQBAJ&pg=PA306 |title=Mechanisms and Emerging Therapies in Tremor Disorders |last2=Manto |first2=Mario |date=2023-10-20 |publisher=Springer Nature |isbn=978-3-031-26128-2 |pages=306 |language=en}}</ref>  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.

The degree of tremor should be assessed in four positions. The tremor can then be classified by which position most accentuates the tremor:<ref name="pmid7001967">{{cite journal | pmid = 7001967 | volume=93 | title=Physiologic and pathologic tremors. Diagnosis, mechanism, and management | date=September 1980 |vauthors=Jankovic J, Fahn S | journal=Ann. Intern. Med. | issue=3 | pages=460–5 | doi=10.7326/0003-4819-93-3-460}}</ref>

{| class="wikitable"
|-
! Position !! Name !! Description
|-
| At rest || Resting tremors || Tremors that are worse at rest include Parkinsonian syndromes and [[essential tremor]] if severe. This includes drug-induced tremors from blockers of [[dopamine receptor]]s such as [[haloperidol]] and other [[antipsychotic]] drugs.
|-
| During contraction (e.g. a tight fist while the arm is resting and supported) || Contraction tremors || Tremors that are worse during supported contraction include essential tremor and also cerebellar and exaggerated physiological tremors such as a hyperadrenergic state or hyperthyroidism.<ref name="pmid7001967" /> Drugs such as [[adrenergic]]s, [[anticholinergic]]s, and [[xanthine]]s (such as caffeine) can exaggerate physiological tremor.
|-
| During posture (e.g. with the arms elevated against gravity such as in a 'bird-wing' position) || Posture tremors || Tremors that are worse with posture against gravity include essential tremor and exaggerated physiological tremors.<ref name="pmid7001967" />
|-
| During intentional movement (e.g. [[finger-to-nose test]]) || Intention tremors|| [[Intention tremor]]s are tremors that are worse during intention, e.g. as the patient's finger approaches a target, including cerebellar disorders.<ref name=":1" /> The terminology of "intention" is currently less used, to the profit of "kinetic".
|}