emotion can only be avoided when you strictly follow you trading strategy. When ever a trader trade without any planning he is likely to face loss and then that fear of loss causes him to trade less in the future and miss several opportunities of making profit. and Fear can be used by a trader to avoid losses and fear of loosing money keeps a trader working and do proper analysis and study and always be careful while trading in these markets but at the same time too much fear is not good as it can keep traders away from trading at right opportunities .