[Maria M]

I'm 25 yrs old, Over the past few years i've had a handful of episodes where I get a sudden, very sharp pain on the left side of my chest.It's very painful when I move but I normally have to take a deep breath which makes it even more painful but that makes it go away. I had it happen yesterday at my new job, it suddenly came on and i could hardly move my left arm for the pain, I did my best to grin and bear it so not to cause a fuss, after numerous attempts of deep breaths it wouldn't go away & was so sharp , but could only be felt when i took a deep breath or moved my left side too much.It lasted 7 hours, I tried running, push ups & taking my tight bra off. Nothing worked & it eventually went away on its own. I had no other symptoms & this morning I picked my daughter up on that side when it happened again but stopped when i put her down & i haven't felt it since. What could be causing it?