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Many people associate shaky hands with Parkinsonâs disease, but the most common cause of shaking hands is actually essential tremor. Essential tremor is the most common neurologic disorder affecting adults, but itâs not well understood.
Some common causes of shaking include Parkinson's disease, multiple sclerosis, severely low calcium levels, erratic blood pressure, diabetes and illnesses that make you feel weak, such as heart disease, liver failure and autoimmune disorders.