用英语说，"He has a stomach ache because he ate too much."
来源： stomach ache 是因为胃部不适而产生疼痛的常用说法，ate too much 表示吃得过多。
例句：
"I have a stomach ache because I ate too much pizza."
(因为吃了太多披萨所以我胃疼)
"My stomach hurts from eating too much candy."
(因为吃了太多糖果所以我的胃痛)
"He complained of a stomach ache after eating a large meal."
(他在吃了大餐后抱怨胃疼)