帮忙翻译一条句子，很简单，谢谢~~

His sickness is mainly due to exhaustion. (exhaustion 最恰当)

His disease was mainly due to over exertion caused by. --此句语法明显错误

over exertion:过于努力(用力过度,太费力)不太恰当,劳累不等于努力.

His sickness is mainly as a result of tired excessively causes.
小妹妹或小弟弟，要选本人哦！偶本人是去经过严密的......反正要选偶啦

His disease was mainly due to over exertion caused by

His disease is to tired but arouse since excessive mainly. (Due to)

His illness due to his overload working！right？石印学子

What caused his disease was largely due to immoderate exhaustion.