Assertion: tremor's symptom | /r/CreatedBy | drug withdrawal
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text: The term "tremor" is used to describe the uncontrollable shaking associated with Essential Tremor, a symptom that can be caused by many different factors and diseases -- including Parkinson's disease, multiple sclerosis, fatigue after exercise, extreme emotional distress, brain tumors, some prescription drugs, metabolic abnormalities, and alcohol or drug withdrawal.