Well, crap. After my workout this morning, I saw my regular GP about the knee pain that's been bothering me for a month now (mostly while climbing stairs). I had seen the weekend GP a fortnight ago. He told me to get an ultrasound if it didn't go away, but didn't tell me to do anything special or stop exercising. It turns out he's an idiot. My regular GP examined me and promptly diagnosed suprapatellar bursitis. I'm going to be taking anti-inflammatories every day and halting all running/cycling/training until it goes away. This sucks. I've really been enjoying riding my bike, but evidently I've just been making the issue worse the whole time. CRAP.