It is a painful problem.

这是一个令人头疼的问题。

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The disappearing phenomenon of library books is a painful problem, and its new features have come out in new times.

高校图书馆图书流失现象是一个老问题，在新时期新条件下又出现了一些新的特点。

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Also, you can solve a problem in more than one way in PHP and the dangers of making painful mistakes that become difficult to fix later are never far away.

而且，在php中，解决问题的方法不止一种，比较容易犯那种惨痛的错误，这种错误过后难以订正。

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Chronically untreated cavities can turn into painful abscesses, leading to costly Emergency Room visits and excruciating pain for a preventable problem.

FORBES: George Soros & PBS V. Arthur Laffer

Many parents acknowledged that theirs is a problem of privilege, but they said the process still shouldn't be so painful.

WSJ: Parents Take Gamble For Top School Slots

Her problem is that the Clinton campaign has already been accused of race-baiting, a particularly painful charge given Mr Clinton's previous appeal to black voters.

ECONOMIST: Hillary Clinton has few weapons to hand