Fever suddenly startle jump is a normal situation, in the fever will appear muscle or limb occasional shaking, but need to pay attention to distinguish the fever convulsions, timely exclusion of intracranial infection may occur. 1. Normal situation: when the body temperature rises, the patient’s cerebral cortex will be abnormally excited, it will be easy to appear jumping phenomenon. This is due to the synchronized discharge of neurons in the brain at one time, resulting in uncontrollable twitching of the body muscles and changes in muscle tone, which is usually only present in one part of the body, but may also be generalized. 2. abnormal situation: but need to pay attention to the small children’s neurological development is not perfect, in fever nervous system excitation is more prominent, so it is more likely to occur than adults febrile convulsions phenomenon, if there are recurrent episodes, you need to go to the hospital in time to check, to exclude the central nervous system and intracranial infections, to prevent misunderstanding of the disease and cause serious effects. Patients with fever should be timely physical cooling and drug therapy, under the guidance of a professional doctor to take active intervention measures in conjunction with the individual situation, if the frequent occurrence of convulsions and shaking, it is recommended to do an electroencephalogram examination, to rule out other diseases, to avoid delaying the condition of the serious impact.