What Causes Severe Pain Below The Knee Cap?

I am an olympic weightlifter, 25, female and have EDS Type III. I ve never had it affect my knees, but now, with no injury or change in training, my knee hurts no matter what position it s in, particularly right below the kneecap. There is no swelling, it just aches and feels tight. Nothing seems to help. I ve been icing, elevating and resting it for a few days, but no improvement. I m seeing a PT tomorrow hopefully, but does this sound like something serious?