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{{clarification needed|date=February 2026}} 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'''.<ref>{{citation |title=Bouldering: Movement, Tactics, and Problem Solving |isbn=978-1594855016 |author=Peter Beal |year=2011 |publisher=The Mountaineers Books |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}}</ref> It may occur in an enhanced form as a pathological symptom of conditions such as hyperthyroidism or stimulants such as caffeine.<ref>{{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}}</ref>

==References== {{reflist}} {{Medicine|state=collapsed}} Category:Symptoms and signs: Nervous system Category:Climbing and health