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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.
What causes tremor? Generally, tremor is caused by a problem in the deep parts of the brain that control movements. Most types of tremor have no known cause, although there are some forms that appear to be inherited and run in families. Tremor can occur on its own or be a symptom associated with a number of neurological disorders, including: 1  multiple sclerosis. 2  stroke. 3  traumatic brain injury. 4  neurodegenerative diseases that affect parts of the brain (e.g., Parkinson's disease).