possible causes in my case that I can think of :

来源: snoow 于 2016-12-27 18:21:29 [] [旧帖] [给我悄悄话] 阅读数 : (123 bytes)
本帖于 2016-12-27 18:23:03 时间, 由普通用户 snoow 编辑

strep throat and treatment, long-term stress, lack of sleep, bad mood (anger), poor health to start with...

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