I am a 54 year old female. I have been experiencing an odd feeling behind my left knee. It is almost a pulling or tugging type of feeling. When I drive, lately, the leg gets tingly, and falls asleep sometimes. It doesn't hurt, but is uncomfortable. I do find myself limping a little just so I don't have to feel it tug. I have worked at a doctors office before, and have seen a patient with a DVT, and my leg is not swollen or red anywhere. But, for some reason, it is worrying me...giving me a nagging feeling... What else could it be?