Any time your respiratory system is affected, a shortness of breath is a very likely symptom. However, this one becomes difficult to diagnose because often as people age there is a decline in physical fitness, and the symptom is attributed to being out of shape. While this can very well be the cause, along with anxiety or mental issues, it is important not to rule out the possibility of something more severe.
Is it uncharacteristic of you? Are you finding tasks you normally do becoming more labored? When exercising or doing physical activity, is it taking you longer to catch your breath? These can all be signs of something more serious, especially if it is present and coupled with other symptoms on this list. For a better diagnosis, it is always best to few lung cancer symptoms in a holistic way, to give you and your doctor a better idea of what is happening in your body.