The economic effect of noncommunicable diseases on households and nations: a review of existing evidence.

In developing countries, the noncommunicable disease (NCD) and risk factor burdens are shifting toward the poor. Treating chronic diseases can be expensive. In developing countries where generally much health care costs are borne by patients themselves, for those who live in poverty or recently escaped severe poverty, when faced with large, lifelong out-of-pocket expenses, impoverishment persists or can reoccur.