DMX has called off multiple scheduled performances in California. According to TMZ, DMX’s show in Santa Ana was canceled due to a "medical emergency." Dates in Los Angeles and San Diego have also been postponed, reportedly due to the same medical issue. TMZ says that friends fear that he may have suffered a relapse with his past substance abuse issues. Over the weekend at the Ruff Ryders’ 20-year reunion show at Barclay’s Center in Brooklyn, DMX took the stage and mumbled through his set and went on a lengthy rant. All the best to DMX!