The two issues associated with contact from the westernized world that negatively impacted the Yanomamo were Chagnon argued that disputes over women and revenge for a previous killing or affront were the significant causes of Yanomamö warfare. And secondly, revenge killing often also occurs as a result of a mortal fight over a woman.
It has been found that thousands of gold miners are presently working illegally on Yanomami land, are transmitting deadly diseases that include malaria and measles, and polluting the rivers, fish, as well as forests with mercury. Some Yanomami are living in communities near the mining hotspots and have dangerously concerning levels of mercury in their bodies.
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