Intermittent difficulty in deep breath

Hi,

I experienced this problem about 3 weeks ago and it just happened without prior symptoms.  Sometimes, I feel like I need to take a deep breath and when I try to do it, it feels like that the air intake is only partial.  When I try it for the 2nd time, then it is alright.  I have chronic muscle pain at mid-back close to the right of the spine.  I can breathe normal (including deep breath) when I am lying on the bed.  Sometimes, when the deep breath is unsuccessful, I sometimes feel a slight pain on the top right chest just underneath the collar bone.  The deep breath problem doesn't happen all the time.  When I am very consicous and tell myself that I need to take a deep breath, then the problem will happen.  I don't think I am short of breath as I feel OK when I am exercising.  I discussed the problem with my family doctor and just did an X-ray a week ago.  The result came back normal.  May I ask if this can be symptoms of lung cancer?  I am very worried.  I asked my family doctor if there is any further test to be done and he ordered a pulmonary test for me that is to be scheduled soon.  Can someone please shed some light on this or share similar experience with me?  Thank you so much.


This discussion is related to is CT necessary.