Drought, violence and armed conflict may turn hazards into disasters. In addition, the incidence and risks of diseases, eg malaria, may interact with human vulnerability, worsening disaster risks brought about by urbanisation, climate change, violence and armed conflict. Cross-cutting factors are internal or external to the region or country in the context of disaster risk. Internal factors are often politically derived, whereas external factors may be longer term and much harder to manage or control, for example, climate change and the risk of drought.