The causes of leg pain can be musculoskeletal, neurological, or vascular. Shin splints and stress fractures can result from repetitive sports, such as running. Leg pain can sometimes indicate a serious vascular problems.
Noun. 1. altruism-the quality of unselfish concern for the welfare of others. selflessness. unselfishness-the quality of not putting yourself first but being willing to give your time or money or effort etc. for others; rural people show more devotion and unselfishness than do their urban cousins.
While the definition of altruism involves doing for others without reward, there may still be cognitive incentives that are not obvious. For example, we might help others to relieve out own distress or because being kind to others upholds our view of ourselves as kind, empathetic people.