Pain Under Knee

Pain under knee??
Okay, last night I ran my long run for 90 minutes as part of my half-marathon training program. I've been running 6 days a week for the past 3 weeks, and haven't had any troubles. As of this morning my right knee is hurting, well actually underneath the knee where the knee meets the shin. I was wearing high heel shoes this morning to work, but I was wondering if you had any ideas of what this might be? I've never had any knee problems before and this is pretty painful. I looked on the internet and thought it might be chrondomalcia (spelling?) or iliotibial band syndrome (spelling?) but I'm not sure. Is there any strengthening exercises for the knee joint itself? Should I take the day off of running? I've also been a runner for about 11 years, ever since 8th grade. I was a long distance runner in XC and track in both hs and college and have since run in several 5K's and one half marathon.

Get the answers...

Knee pains (under knee cap)?
I get these random hurting sensations which feels like its under my knee cap, it only lasts up to 10 seconds but its reoccuring I dont play any sports i dont understand why i would have this pain and its not due to the way i was sitting.

Get the answers...

Unbearable knee pain under knee cap!?
Sometimes when my knee stays bent for like say 20-30 minutes at a time while I'm laying down or sitting on a chair i'll get the worst pain ever in my knee. It feels like a cramping/burning sensation on the inside of my knee. I've had it when my leg was straight too.. just having it bent causes it to happen a little bit more often.

Get the answers...