如果你的胃痛，你可以说 "I have stomach pain"。这个短语来自英语中胃的词源，即古代法语的 "estomac"，意思是胃。例句：

"I have stomach pain." (我胃痛。)

"I think I ate something that didn't agree with me." (我想我吃了一些不合适的东西。)

"I think I have a stomach virus." (我想我感染了胃病毒。)

希望这些信息对你有帮助！如果你的胃痛很严重，请务必咨询医生。