Lots of people usually do not realize that our physical body has it's own unique anti-inflammatory chemical substances which it uses to manage inflammation. This self contained system which the physical body uses to put an end to inflammation is fueled by an essential nutrient-- omega 3 . ( Most medical doctors appear to have forgotten this simple fact). If omega 3 fats are not sufficient in the diet, which they are for all third world people then the body does not have the raw material which it requires to make it's own anti-inflammatory compounds. Consequently inflammed joints stay inflammed and painful. On the other hand when you supply these required omega 3's by using a fish oil supplement, the physical body commences producing it's own anti-inflammatory substances once again and the joint pain and inflammation go away.
http://www.youtube.com/watch?v=9LHf6A6EcCw
http://www.dailymotion.com/video/x2uv273