diarrhea · noun U /ˌdɑɪəˈri.ə/Full view
C2 an illness in which your solid waste is more liquid than usual, and comes out of your body more often
Dictionary example:

She has diarrhea.

Learner example:

In the end, however, we need to listen to our own body and make sure that the nutrition suggested by nutritionists and doctors is also accepted by our metabolism, i.e., not greeted with diarrhea, nausea, etc. (Certificate of Proficiency in English; C2; German)

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