<unk>  is an involuntary, rhythmic, oscillatory movement, and it is the most common involuntary movement disorder. Essential<unk> , Parkinson's disease and enhanced physiologic<unk>  are the common causes of<unk> s in a primary care setting. Essential<unk>  is the most common. Other causes are caffeine intake, excessive alcohol, hypoglycemia, stress, anxiety, depression, fatigue, Wilson's disease, hyperthyroidism, multiple sclerosis, normal aging.<unk>  can be classified into resting and action. Action<unk>  is further divided into  postural, kinetic (simple or intentional), isometric and task-specific<unk> .<unk>  is thought to be the result of a combination of different mechanisms that could result in oscillatory/rhythmic movement. These mechanisms are mechanical oscillations, reflex oscillations, central oscillations, and cerebellar oscillation.<unk>  must be differentiated from diseases that cause involuntary movement: myoclonus, clonus, asterixis, and epilepsia partialis continua. Essential<unk>  and Parkinson's disease worsens with time,<unk> eatment helps minimizing symptoms. Physiologic<unk>  does not worsen with age.
Tremor
Pallor
Catatonia
Psychomotor agitation
Snatiation
Somnolence
Stuttering
Myoclonus