Um that's literally the definition of a refugee. Or perhaps your definition of "problems" needs clarifying?
Forced to flee
Other definitions range from :
a person who has been forced to leave their country in order to escape war, persecution, or natural disaster.
A refugee, conventionally speaking, is a person who has lost the protection of his or her country of origin and who cannot or is unwilling to return there due to well-founded fear of persecution.Pakistan is certainly a place some people would want to flee from, Malala Yousafzai being the most obvious example of the terrors that have happened there.