The United Nations says between March 8 and 27, more than 53,000 people fled the Haitian capital, Port-au-Prince, to escape a surge in gang violence over the past few weeks.
The UN is warning that the rural regions to which many have fled are not equipped to deal with such a large influx of displaced people.
Meanwhile, gangs are attacking businesses in the capital, torching pharmacies, and vandalising schools.
Haiti's national police succeeded in repelling an attack on the presidential palace on Monday, but armed men stormed the nearby State University of Haiti hospital, known by its initials HUEH, to use it as their command centre.
The hospital had closed last month due to the violence and should have reopened on Monday.