PLT DIVERTS AND LANDS AT GRR DUE TO ILL CABIN ATTENDANT.

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WHILE AT CRUISE; THE FLT ATTENDANT ADVISED THE CAPT AND I VIA THE INTERPHONE THAT SHE WAS EXPERIENCING ABDOMINAL PAINS; FREQUENT NEED TO URINATE; AND HAD NOTICED BLOOD IN HER URINE. SHE DID NOT FEEL THAT IMMEDIATE ACTION WAS NECESSARY; OTHER THAN POSSIBLY SEEKING MEDICAL ATTN UPON ARR AT THE DEST; SOME 45 MINS AWAY. 10 MINS LATER; THE FLT ATTENDANT CALLED AGAIN AND ADVISED THAT SHE WAS IN MUCH MORE PAIN AND WAS BLEEDING 'A LOT.' THE CAPT AND I INITIATED AN IMMEDIATE DIVERT INTO GRR. THE CAPT CONTACTED COMPANY DISPATCH AND OPS ON COM #2 WHILE I WORKED WITH ZOB AND GRAND RAPIDS APCH ON COM #1 AND FLEW THE AIRPLANE. THE DSCNT; APCH; AND LNDG ON RWY 35 WERE UNEVENTFUL. MEDICAL PERSONNEL MET THE FLT AT THE GATE AND TRANSPORTED THE FLT ATTENDANT TO A LCL HOSPITAL VIA AMBULANCE. NO TFC CONFLICTS OCCURRED AS A CONSEQUENCE OF THE DIVERSION; AND THERE WERE NO INJURIES TO ANY CREW OR PAX. THE FLT ATTENDANT WAS TREATED AND RELEASED SOME 7 HRS LATER. ATC WAS EXTREMELY HELPFUL AND COOPERATIVE THROUGHOUT THE DIVERT.