Is this chest pain serious?

For the last few days whenever I lay on my left side, the right side of my chest hurts. Like a stabbing pain but only for a brief second when I take a deep breath, when I move a little it goes away but comes back every so often, is this anything serious? Could I have pulled something? It s fine any other time only... show more For the last few days whenever I lay on my left side, the right side of my chest hurts. Like a stabbing pain but only for a brief second when I take a deep breath, when I move a little it goes away but comes back every so often, is this anything serious? Could I have pulled something? It s fine any other time only when I lay on my left side thanks
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