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.
Altruism. 1  In evolutionary biology, altruism is defined as behavior that benefits other organisms but has some costs. 2  The costs and benefits are measured in terms of reproductive fitness (i.e. expected number of offspring). In evolutionary biology, altruism is defined as behavior that benefits other organisms but has some costs.