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Neurological illnesses or a conversion disorder can cause muteness with no apparent reason. See this related question over at cogsci.stackexchange.com: https://cogsci.stackexchange.com/questions/44...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/8739 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Neurological illnesses or a conversion disorder can cause muteness with no apparent reason. See this related question over at cogsci.stackexchange.com: [https://cogsci.stackexchange.com/questions/4458/why-does-a-person-temporarily-go-blind-without-any-apparent-cause](https://cogsci.stackexchange.com/questions/4458/why-does-a-person-temporarily-go-blind-without-any-apparent-cause)