The 28-year-old was smashed across the face with a glass bottle whilst making an appearance at a venue in China, Thursday evening.
The R&B star was there to perform onstage, and at one point stepped in to break up a fight which erupted in the crowd, according to TMZ.
It was during the fracas that he subsequently had a bottle broken on his face.
Several hours later he underwent minor surgery to patch up a large cut he sustained on his lip.
But the following day, the rapper failed to wake up and one of his back-up dancers rushed him to hospital.
He is currently in a coma and sources tell the website that his condition is 'dire'.
Meanwhile, Raz-B's publicist has urged fans to pray for his client.
'He is in a coma and needs as many prayers as possible,' Toy Jones told TMZ.
Raz is said to be currently breathing with the aid of a ventilator and is in and out of consciousness.
This isn't the first time the star has been severely injured.
Last year he nearly died after falling through a sliding glass door, again whilst on a trip to China to perform.
The singer, born De'Mario Monte Thornton, lost a near-fatal amount of blood following his hazardous trip and was rushed to hospital for emergency surgery.
At the time, Raz told TMZ that he 'tripped hard inside his room... and when he tried to break his fall, he crashed through a sliding glass door'.
As he tweeted a rather gruesome snapshot of his gauged wound, he wrote: 'MAN.... Cherish life and your loved one's. You just never know. THANK YOU LORD FOR SAVING MY LIFE.'
Unconscious: The singer is said to be in and out of consciousness and is breathing with the aid of a ventilator
The shocking picture showed the brutal results of the fall, including visible bone, as the broken glass tore the Cleveland native's wrist and pierced through his ligaments, nerves and tendons.
Fortunately, Raz was with a companion at the time of the fall who was able to alert the hotel and call an ambulance - as the Bump Bump Bump singer passed out at the sight of gushing blood.
While the doctors at Huashan Hospital Fudan University worked their magic during a five hour procedure, Raz was still forced to cancel his remaining tour dates so he can recover.
Group: Raz-B is best known for being in the American R&B group B2K
Raz-B also hit headlines in 2012 when he became embroiled in an online war with Chris Brown.
The No Air star took dislike to a comment that Raz made in a tell-all book, claiming Brown had been involved in a same-sex romance with rising star Andre Merritt.
Chris tweeted: 'Lying on someone in a book to sell it is called "defamation of character"! Don't believe the bulls**t.