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.
French philosopher Auguste Comte coined the word altruisme (with meaning 3) in 1851, and two years later it entered the English language as altruism. Many considered his ethical system - in which the only moral acts were those intended to promote the happiness of others - rather extreme, so meaning 1 evolved.