I ate too much and got a terrible stomach ache.

我吃得太多了 胃疼得厉害

Generally speaking, stomach ache is not a big deal.

一般来说胃疼没什么大事。

Sorry that I cannot go to the airport to pick you up in person on account of stomach ache.

很抱歉我不能亲自去机场接你，因为我肚子痛。

This value stream map illustrates the process of a patient coming into the hospital with a stomach ache.

这张价值流程图描述的是一名胃痛病人进入医院后的就诊流程。

I think I've got stomach ache.

我有些胃痛。

I've had stomach ache all morning.

整个早上我胃痛。