お腹なかがゆるい

expression, i-adjective

have an upset stomach; have loose bowels

Describes a condition where one's stomach is unsettled, often leading to soft or loose stools. A common, mildly euphemistic expression.

• 昨日きのうからお腹なかがゆるくて、何なん度どもトイレに行いっている。

  My stomach has been upset since yesterday, and I've been going to the bathroom many times.

• 冷つめたいものを飲のみすぎると、お腹なかがゆるくなることがある。

  Drinking too many cold things can sometimes make your stomach loose.