How long does persistent diarrhea last?

Persistent diarrhea is generally defined as diarrhea that lasts longer than two days but typically does not exceed four weeks. Therefore, the duration of 2-4 weeks is considered the correct answer, as it encompasses the common timeframe for what qualifies as persistent diarrhea. A clinical definition helps healthcare providers assess the severity and potential underlying causes of the condition, determining appropriate interventions.

Diarrhea lasting for 1-2 days is usually categorized as acute diarrhea and often resolves on its own without the need for medical treatment. When diarrhea extends beyond two weeks, it becomes crucial to explore potential chronic causes, making options that indicate longer durations of persistence less applicable as 'persistent' diarrhea is established within the 2-4 week range.