I keep getting a sharp stabbing pain, that actually makes me involuntarily cry out or draw in a sharp breath, in the back of my left knee. It happens at totally random times but is fairly regular and always in the same place. Do you think it is worth getting it checked out or would I be wasting both the doctor's and my time? By the way, I haven't been on any long-haul flights (or any flights at all for that matter!!)so can I rule out DVT?