A nervous shiver is mainly due to the following two reasons: 1, may be endocrine abnormalities; 2, may be a problem with neural regulation. Endocrine performance is mainly in the time of tension, anxiety appears adrenal hormones, as well as the secretion of some neurotransmitters appear abnormal, this time it is easy for people to appear a variety of physical performance, such as panic, hand trembling, muscle tension, especially the neck, back muscle stiffness, tension, soreness. In terms of neuromodulation, autonomic regulation under stressful conditions such as tension and high stress makes people become panicky, hand trembling, and muscle trembling. It is also possible that some people develop conditioned reflexes and associate with body tremors when they are tense, and it is easy to have body tremors after being tense.