diarrhea
痢 centers on a specific intestinal illness: diarrhea, characterized by loose or watery stools.
痢 combines 疒 (sickness) with 利, which likely contributes the sound and may relate to the idea of something passing through quickly.
The sickness enclosure 疒 wraps around 利, like an illness that makes things pass through the body too quickly, resulting in diarrhea.
For リ, imagine a person with diarrhea needing to rush to the loo repeatedly: the repeated 'ree' sound of urgency cues リ.
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diarrhea; diarrhoea
dysentery
amoebic dysentery; amebic dysentery; amoebiasis
diarrhea; diarrhoea
loose stool; watery stool
antidiarrheal; paregoric; obstipant
diarrheal disease; diarrhea
secretory diarrhea
traveler's diarrhea; traveller's diarrhoea
antidiarrheal; antidiarrhoeal
(very) watery diarrhea
osmotic diarrhea
exudative diarrhea
diarrhea; diarrhoea
children's dysentery
diarrhea; diarrhoea
dysentery
shigellosis; bacillary dysentery
shigella (dysentery bacillus)