According to Todd Archer of ESPNDallas.com, Cowboys wide receiver Dez Bryant is suffering from Patella tendonitis.
@espndallas – Patella tendinitis for Dez Bryant. Rest is the word. Too early to know if he plays in preseason
— Todd Archer (@toddarcher) August 20, 2012
As far as I know, the only way for Bryant to feel better, is to rest his knee.