People’s hands shake when they are nervous, when they are intimidated by tension, and when they are emotionally excited by fear causing finger muscle twitching. There are many causes of hand trembling, because the sympathetic nervous system excitement caused by excessive secretion of adrenaline, sympathetic nerves belong to the vegetative nervous system, is an important system to maintain the normal physiological metabolism of the human body, has an excitatory effect on the human body, sympathetic excitement makes the performance of pupil dilation or muscle contraction, may also be caused by increased secretion of glands, increased digestive juices, tissue metabolism, accelerate the rise in body temperature. The state of finger trembling can be slowly relieved, no treatment is needed, the state of excitement will cause an increase in blood pressure, insufficient blood supply to the heart muscle, usually should be calm, do not have too much emotional fluctuations. If there is still hand trembling after the tension may also be Parkinson’s syndrome, need to go to the hospital special treatment.