Hi there, From last six months I am having a pain in my left arm,in upper shoulder and some in back and sometimes happen to my left leg too.Pain in left arm is like a something sweer pain,so when I press it,I feel reliefs from the pain.Pain increase when I lie down by left side,or by back.It relieved when I walk,run or stand.I do regular walk in morning.But I sit on comouter at least 8-9 hours day.