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The term "trembles" refers to a severe poisoning in livestock, particularly cattle, caused by consuming white snakeroot. This plant contains a toxic alcohol called trematol. Symptoms in animals include muscular tremors and weakness. Humans can be poisoned by drinking the milk of affected cattle, leading to symptoms like loss of appetite, nausea, weakness, and in severe cases, convulsions and coma.12

Separately, "essential tremor" is a nervous system disorder characterized by involuntary oscillating movements, most commonly affecting the arms, hands, face, head, and neck. It can make daily tasks difficult and is often hereditary, though its exact cause is unknown. Treatments include medication and, in some cases, surgery.34

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