Anxiety can be caused by lack of sleep.

睡眠不足可能导致焦虑。

《牛津词典》

Anxiety can also be caused by early trauma, something that went wrong in your life when you were young.

早年的伤痛，也就是幼年时不顺利的经历也可以引起焦虑。

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But this feeling can be characterized rather as anxiety and mounting concern caused by this country's might.

但这种感觉可以被描述对这个国家实力增强所造成的焦虑和日益增长的关注。

youdao

It can be caused by psychiatric problems such as depression, anxiety disorders and schizophrenia.

BBC: High sleeping pill use 'worrying'