hi you may need to do some research to get to the bottom of his problem. but this could be from bullying at school he's angry from what's happening to him and this could be what's behind the crying. do hope this helps you. good luck
my 13 year old son feels angry and cries in the evening sometimes and does not know why. what could cause this? . he is fine all day and then he cries in the late evening sometimes. he says he feels very angry and he has no idea why he feels this way. i have explored the possibility of low blood sugar and that may be the cause but i am wondering what other things may cause such a reaction.