Good Afternoon Dr. Rynne, I am a 52 year old woman who has been very physically active (work out at gym 4-5 days/week)for about two years now. I take strength classes as well so I know my knees are strong. However, last Monday, 5/8 I noticed pain in my left knee. It hurt to bend and straighten the leg. there is no swelling or bruising. I applied ice for first 24 hours, but the heat has helped a lot. I stayed away from the gym all last week to rest as much as possible. Last night, I went back to the gym, modified everything and was good. I woke up able to move my leg/knee well without hardly any pain. I have been taking Tylenol(cannot take Ibuprofen-am a bariatric patient as well and have lost 120 pounds). I do not think this is a blood clot. I think maybe tendonitis or something in that area. Prior to bariatric surgery, I never worked out at all so I know this was a big shock to my body. today at work(I have a sit down job) I have tried ice without relief but heat works better now. I can at least walk around and bend my knee better. I think it is time to see my doctor. thank you.