Pain on left side

Today, whiel dressing up, when my left arm was raised up, I felt pain on my left side of my left breast...
What might it be due to ?
It happened many times whenever I rasied my arm, like while taking shower, dressing up, putting up talc etc. While now...

I m sititing, I do notface it now...only first time it happened and I m wriitng to u..please tell out of your experience...thx

go to the hospital get some to loook at it

 
It's probably just a sprained/strained chest muscle. If it lasts more than a couple days then it's time to see your doctor.

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