Sources with direct knowledge tell TMZ ... #KrayzieBone is going into a second surgery soon in the hopes of stopping some internal bleeding, which is at the root of his health troubles. We're told this all started Friday when KB started coughing up blood, after which he checked himself into an L.A.-area hospital. After some tests, our sources tell us docs discovered a bleeding artery in one of his lungs ... and they operated on him. Afterward, we're told Krayzie was placed in an induced coma -- with the idea being that would help the healing process -- but our sources say the issue wasn't resolved, and that the artery continues to bleed in his lung. Now, they're going back to try and fix it for good. Via tmz_tv • Riemoh