Physiologic tremor

{{Infobox medical condition

|name =

|synonym =

|image =

|image_size =

|alt =

|caption =

|pronounce =

|specialty =

|symptoms =

|complications =

|onset =

|duration =

|types =

|causes =

|risks =

|diagnosis =

|differential = Hyperthyroidism

|prevention =

|treatment =

|medication =

|prognosis =

|frequency =

|deaths =

}}

Physiologic tremor is a tremor or trembling of a limb or other body part. The recorded frequency is in the range of 8-12Hz. It occurs in normal individuals, especially when they are stressed by anxiety or fatigue. It is therefore common in sports such as rock-climbing where it is known by names such as Elvis leg or sewing machine leg.{{citation |title=Bouldering: Movement, Tactics, and Problem Solving |isbn=978-1594855016 |author=Peter Beal |year=2011 |quote=Elvis leg: Uncontrollable shaking in the lower leg caused by fear and fatigue. Best prevented by relaxing and dropping your heels when standing on footholds}} It may occur in an enhanced form as a pathological symptom of conditions such as hyperthyroidism or stimulants such as caffeine.{{citation |page=495 |chapter=Abnormalities of Movement |title=DeJong's The Neurologic Examination |author=William W. Campbell |publisher=Lippincott Williams & Wilkins |year=2012 |isbn=978-1469817521}}