I went on my honeymoon (10 hr flight) a little over one month ago. Upon arriving at our destination, I had a mild pain behind my left knee, but nothing really serious. Since then, the pain behind my knee has continued on and off throughout the month. This weekend, the pain definitely progressed so I have been examining the painful area. I definitely have superficial veins that are visible, though I do not yet have any varicose veins. I am 25 yrs old, female, and in decent shape. I do not have any other risk factors for dvt besides the long flight. But the pain has become quite persistent, right behind my knee, and it's definitely a very deep pain. Should I make an appointment to see my doctor to have an ultra sound done of the painful area? Or is it rediculous to think that a 25 year old, otherwise healthy woman would have dvt. I don't want to be a hypochondriac, but I also don't want to suffer a pe! Any help is greatly appreciated!