高热惊厥是指高热(体温38.5℃以上)而引起的惊厥。高热惊厥在小儿时期最常见,在0～7岁小儿中,高热惊厥的发生率为3%～4%。这主要是因为婴幼儿的神经系统发育不完善,如大脑皮质的抑制功能差,神经髓鞘未完全形成,一旦受到外界刺激(如高热等),兴奋容易扩散而引起抽搐。第一次高热惊厥往往出现在6个月至3岁幼 Convulsive fever refers to high fever (body temperature above 38.5 ℃) caused by convulsions. Convulsions are most common in infancy, and in children 0-7 years, the incidence of febrile seizures is 3% to 4%. This is mainly due to imperfect neurological development in infants and young children, such as poor cerebral cortex inhibitory function, incomplete formation of nerve myelination, once stimulated by the outside world (such as fever, etc.), excitability easily spread and cause convulsions. The first febrile seizures often appear in 6 months to 3 years old