Upper left abdominal very quick sharp pain not severe pain it also happens in different places on my abdominal and back , my urine and stools are ok ?

Usually not serious: Abdominal pain of sudden onset that lasts only a few seconds, occurs only rarely, and is unaccompanied by other symptoms is almost never more than the passage of gas within the bowel, not a serious problem. But you write that you are a 26 year old man with a history of lung cancer! If that is accurate, report this symptom to your oncologist for evaluation.