Your problem with keeping boyfriends is just a symptom of a larger problem: making and keeping friends.

你无法留住男友的问题只是一个更大的问题的征兆：结交朋友并与其维持关系。

《柯林斯英汉双解大词典》

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The symptom of this problem is that a complex data object that is sent as a parameter or returned as a response may be missing certain elements.

此问题的征兆就是：一个作为参数发送或作为响应返回的复杂数据对象丢失了某些元素。

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These bonuses,outrageous as they are, are a symptom of a much larger problem.

VOA: standard.2009.03.19

As explained in this video, spending is the problem and deficits are a symptom of that problem.

FORBES: Sen. Corker's Plan To Reduce The Fiscal Burden Of Government

Thus, it is possible that the tau protein might not be the problem, but rather a symptom of the problem.

ECONOMIST: Dementia

Apple is a symptom of that problem hoarding cash it is too scared or unimaginative to spend.

FORBES: Solving Apple's Innovation Problem