Krayzie Bone is reportedly fighting for his life in a hospital -- a scary update that has much of Hollywood sending their thoughts and prayers his way.
The Bone Thugs-N-Harmony rapper is said to be on a ventilator as a result of surgery to deal with a respiratory issue he's been battling, which saw him coughing up blood and requiring to go under the knife immediately ... this according to AllHipHop.com.
The outlet reports KB's initial hospitalization stems from a diagnosis of sarcoidosis -- which causes inflammatory cells to form in different parts of the body.