一些医生还说有些处方用药过量，而且经常为一些不严重的小毛病如消化不良和肚子疼所开的处方。

Some doctors say they are overprescribed and are often used for less-severe ailments like indigestion or upset stomachs.

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不太常见的原因包括滥用药物和过量服用一些处方药。

Less common causes include drug abuse and overdoses of some prescription medications.

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