I'm a 23 year old female, no medical issues or conditions in the past, including asthma. I have had shortness of breath for about 3 years now, sporadically. I first noticed it my sophomore year of college, when I was constantly under stress from classes and a job. I went to the doctor shortly after noticing the symptoms, and I was given a chest x-ray and had several other tests run. My doctor told me it was stress-related and basically left it at that. Now that I am out of school, I still sometimes feel like I can't take a deep-enough breath, though I only occassionally feel stressed, and to a much lesser degree. I don't experience chest pain, numbness, or dizzy spells, I just feel like I can't take a deep breath. It doesn't seem any worse or better different times of the year or day, or when I lie down or exercise. Can anyone help me out? Thanks. The shortness of breath occurs regardless of what I'm doing (exercising, talking, watching tv, etc.) I was not exposed to large amounts of second-hand smoke as a child or even now. I am 5'7" and weigh 130 lbs. No anxiety issues that I know of Thanks!