The Nigerian health system is pluralistic, including orthodox, alternative, and traditional systems. Healthcare is administered through three tiers - primary run by local government, secondary by state government, and tertiary by the federal government. Nigeria has a large stock of health workers, but faces many health challenges like malaria, HIV/AIDS, and lacks adequate sanitation and access to clean water. Healthcare is financed through taxes, out-of-pocket payments, donors, and health insurance though coverage of the National Health Insurance Scheme remains low, only covering formal sector employees.