The relief group, Doctors Without Borders, says refugees in northern Uganda are dying at an alarming rate, due to poor living conditions.
The head of the group's mission in Uganda, Monica de Castellarnau, says refugees lack access to safe food, water and health care, and says they are constantly at risk of attack by rebels.
She says death rates for children under five years of age are especially high in camps in northern Lira and Pader districts.
Doctors Without Borders also says studies in the area found that nearly all respondents had been exposed to traumatic events in the past two years, such as the kidnapping or death of a loved one due to the insurgency.
An estimated 1.6 million people have fled their homes in northern Uganda, where government forces have been battling rebels for 18 years.
Some information for this report provided by Reuters.