The infected students complain also of stomach pain and headache, SCR News reporter says.
Ghegar hostel is in the outskirts of Renk Town and lacks basic services.
Keat Bayak, a patient student, said the outbreak comes from bad water.
He added that students use untreated water directly from the Nile.
So far seven cases of diarrhea were reported.
James Kon, the head of the hostel, said the administration reported the outbreak to the Student Welfare Fund.
He added that they started treating the water used in the hostel.