Sharp pains in chest?

lately I've been getting sharp pains in my chest i try to brush them off and not pay attention but i still get them.sometimes I'll get a dull sharp pains in my neck or back of my arm.but the ones in my neck or the back of my arm dont come as much as the ones in my chest but um how can i pinpoint whats causing my sharp pains do i get a cat scan ,or what please help im kinda scared.