Dysentery is a disease that involves severe diarrhea. It is caused by a bacterium, which causes the intestines to swell up a lot. The main symptom of dysentery is having blood in the excrement. Some more symptoms are high fever and abdominal pain. It is usually treated with antibiotics. The diarrhea is severe and can be a problem for the people who catch the disease. It may be known diarrhea your guts out.