Keep getting a sharp chest pain ?

In the middle of my chest it lasts about 1/2 a second and it's super sharp and it hurts and scares me. this used to happen a few years ago and my doctor gave me a heart monitor and it showed nothing. Then the issue went away Now the issue is back I'm 21 years old - female, and I'm only... show more In the middle of my chest

it lasts about 1/2 a second and it's super sharp and it hurts and scares me.

this used to happen a few years ago and my doctor gave me a heart monitor and it showed nothing. Then the issue went away

Now the issue is back

I'm 21 years old - female, and I'm only about 110 pounds 5 foot 4 so I'm not overweight or anything...

what is this ???
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