I have had an ongoing problem with pain to my upper left side just below the ribs for at least 18 months now. I have had blood tests and ultrasound scan carried out around 8 months ago which came back normal, so I am at a loss to what the cause of pain can be. I have also had scopes done to check my stomach and bowel, both normal except slight inflammation to the stomach. Today I have became more worried as the pain has radiated to the left side and back, which is like a sharp stabbing pain. I have horrible thoughts going through my head that cancer may be the cause, such as cancer of the lung. Please help.