Thank you for the speedy reply, i am sorry to hear you have lung cancer, i have had various x-rays and scans and there was no sign of cancer, this condition started when i was in work i bent down to pick a box up and found i was very breathless i went to see my doctor who ordered lots of tests but they came back fine, the hospital has no explanation and say it may right itself or may not, i was diagnosed with very mild COPD which doesn't bother me at all.