Overpopulation can lead to overcrowding and poor quality housing in many large cities. Poorly heated or damp housing could cause significant health problems, resulting in illness, such as bronchitis or pneumonia. Another serious consequence of overcrowding is a rising crime rate as poor living conditions may lead young people in particular to take desperate measures and turn to crime or drugs.
In terms of solutions, I believe the government should be largely responsible. Firstly, it is vital that the state provides essential housing and healthcare for all its citizens. Secondly, setting up community projects to help foster more community spirit and help keep young people off the street is a good idea. For example, youth clubs or evening classes for teenagers would keep them occupied. Finally, more effective policing of inner city areas would also be beneficial.