Public health
Most countries have their own government public health agencies, sometimes known as ministries of health, to respond to domestic health issues. Many diseases are preventable through simple, non-medical methods. Public health plays an important role in disease prevention efforts in the developing world and in developed countries, through local health systems and through international non-governmental organizations. In the developing world, there may not be enough trained health workers or monetary resources to provide a basic level of medical care and disease prevention.