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Diarrhoea
Spelling Challenges
The spelling 'diarrhoea' is British; Americans use 'diarrhea'. Both refer to the same condition. 
Cultural Sensitivity
Diarrhoea is a medical condition but can be embarrassing to discuss; be sensitive in conversations. 
Severity Levels
The word can describe a range of severity, so context or adjectives like 'severe' or 'mild' clarify. 