韦斯特症候群或韦氏症候群（West syndrome）是发生于婴幼儿身上罕见的癫痫失调症状。此症状依其发现者英国医师威廉·詹姆士·韦斯特William James West（1793－1848）来命名。韦斯特医师于1841年时首次于《柳叶刀》（The Lancet）期刊中描述该症，其所描述之病例其实是他的儿子詹姆士·爱德温·韦斯特（1840－1860）之症状。该症的其它名称尚有泛发性癫痫、婴儿型癫痫性脑症、婴儿型肌抽跃脑症、折刀式癫痫、粗大性肌阵孪、点头状癫痫等。婴儿点头式痉孪通常用来表示韦斯特症候群中特定的癫痫表现形式，但通常也可指与韦斯特症候群一词通用。韦斯特症候群通常需符合以下三种条件，一为婴儿点头式痉孪，二是脑电图(EEG)上呈现之脑波为高振幅混乱之棘慢波混合(Hypsarrhythmia)以及智能障碍(Mental Retardation)等三种，虽然就国际普遍定义来说，只要符合三种条件中的两种，即可判定为韦斯特症候群。

Epileptic spasms, infantile spasms, juvenile spasms or West syndrome is an uncommon-to-rare epileptic disorder in infants, children and adults. It is named after the English physician, William James West (1793–1848), who first described it in an article published in The Lancet in 1841. The original case actually described his own son, James Edwin West (1840–1860). Other names for it are "Generalized Flexion Epilepsy", "Infantile Epileptic Encephalopathy", "Infantile Myoclonic Encephalopathy", "jackknife convulsions", "Massive Myoclonia" and "Salaam spasms". The term "infantile spasms" can be used to describe the specific seizure manifestation in the syndrome, but is also used as a synonym for the syndrome itself. West syndrome in modern usage is the triad of infantile spasms, a pathognomonic EEG pattern (called hypsarrhythmia), and developmental regression - although the international definition requires only two out of these three elements.