回複:四歲的孩子昨天下午回來叫右腿疼,問過老師在學校裏也沒有摔過,現在走路都疼,約了

my son had the similar problem last year.  It was caused by cold virus, and it is not unusuall.  It will recover in a couple of days.  Check if your son had other cold symptems, if so, it's likely caused by cold virus.

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