1. Stomachache  胃痛；肚子痛

　　Ache 一般作为单词后缀, 比如：头疼：I’ve got a headache.胃疼：I’ve got a stomachache.牙疼：I have a toothache.

　　2. a.  have an upset stomach 胃不舒服；闹肚子 (upset: 混乱的；令人不安/心烦的)

　　Eg: My stomach gets upset every time I have hotpot. 每次吃火锅我的胃都会不舒服。b. have a disordered stomach 胃不舒服 (disordered : 失调的，紊乱的)c. something       wrong  with my stomach 胃有点不对劲/不舒服 

　　3. Diarrhea 腹泻

　　Eg: I have diarrhea. (注意不是have a diarrhea, diarrhea是个不可数名词)

　　4. Have the runs/trots 拉肚子 (runs: 奔跑,垂流;  trots: 小跑，腹泻)

　　Eg: Did you throw up or did you have the runs? 你有没有呕吐或者拉肚子 

      5. Have a runny tummy 拉肚子 (runny: 流鼻涕的，水分过多的；tummy: 肚子)

　　Runny nose 流鼻涕 

      6. have cramps 腹部绞痛; period pain 痛经

　　Eg: I’ve got my period and now I’m having cramps. 生理期来了我有点痛经