Bone Thugs-N-Harmony's Krayzie Cancels Tour ... Battling Potentially Fatal Disease

Bone Thugs-N-Harmony rapper Krayzie Bone was forced to postpone his tour because he's battling the same disease and flu like symptoms that killed comedian Bernie Mac.

Krayzie tells TMZ he suffers from sarcoidosis, an autoimmune disease that attacks the lungs. He thinks he came down with an intense case of pneumonia during a Canadian tour because his sarcoidosis meds weaken his immune system.

His doctors didn't want to take any chances, so they ordered Krayzie to cancel the rest of his gigs and head back to L.A. for treatment.

The rapper expects to make up the missed shows once he recovers.