尽管大多数情况下医生并不知道明确的病因，但是癫痫和脑损伤、肿瘤或者感染相关。

Although in many cases doctors don't know what causes it, epilepsy can be related to brain injury, tumors, or infections.

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颈内动脉岩段动脉瘤可以是创伤或真菌感染所致，但在大多数病例中，没有明确的病因，通常被认为是先天性。

Petrous ICA aneurysms can be traumatic or mycotic in origin, but in the majority of cases, there is no obvious cause, and such lesions are considered congenital in origin.

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现在，“青年隐蔽”的病因还不明确，但媒体通常报道说欺凌、考试不及格或者找不到工作之类的创伤性事件导致了这一问题。

And while it’s not clear exactly what causes hikikomori, traumatic events such as bullying, failing a test or not getting a job are often reported as triggers.

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