There are 3 types of diarrhea. Acute Watery Diarrhea is most common, and lasts for several hours or days. Persistent Diarrhea lasts a minimum of 14 days or longer. Acute Bloody Diarrhea, also known as dysentery, is the passing of loose, bloody stools. In the event of bloody stool and/or persistent diarrhea, always consult with a doctor or HCP.