When I woke up this morning my knee was killing me. Lately I've been running a mile or 2 each night and also running steps at the local hs stadium. It feels tight. It hurts when I bend my leg back. Also there is a tightness feeling around the knee cap. For instance if you were to put your index fingers together and your thumbs together and then placed that on top of the knee you get the picture of the area thats feeling tight. I went out today and played some light basketball and it didn't hurt, but it popped a lot, as if I were cracking my knuckles. I'm interested in knowing what it might be like if it's over use or if it could be something more serious like tendinitis. All incite is appreciated.