problems associated with rapid urbanisation
housing
many people move from other cities or towns, making there be not much space for so many people. This makes those who have less money have to live in shanty-towns. In addition, houses that are on a better state are much more expensive than in other normal cities.
access to water and electricity
as there is so many people, the basic services can provide clean water and electricity for everyone, making some people have to rely o lightning and boiling water to cook.
education
if the population grows very quickly, this means that there cannot be schools for everyone, some of the children don't pass to secondary school because they have to find jobs to support their families.
traffic congestion and transport
transport systems and roads become overloaded because of the high number of vehicles passing through the roads, this causes a high level of atmospheric pollution and can be damaging for our health
health
because of the rapidly increasing population, there are not enough doctors, hospitals and medical service to deal with everyone. Furthermore, being so many people causes a quicker spread of infectious diseases.
employment
many people have problems finding a well payed work, which forces them to find another job that allows them to live the best they can, this includes working for the informal sector, for example cleaners and selling things on the street