There are several reasons for patients to shake their hands when they are nervous: 1. It is possible that too much tension and anxiety may cause autonomic nerve dysfunction, which will reflexively cause panic, muscle tension and trembling at the same time, such as voice trembling or hand trembling and other problems. 2. The problem may be caused by a series of problems such as panic, hand trembling, sweating and blushing. Finally, it is also possible that due to tension, anxiety caused by conditioned reflexes, so that the problem of hand trembling that a nervous shaking, the formation of conditioned reflexes in the long run.