Hisayoshi Chono took an HBP off his head during his at bat in the 8th inning (4th pitch from Hiroshima's Takeru Imamura) and had to be taken off the field on a stretcher (he apparently didn't lose consciousness).
Chono was immediately taken to the hospital for testing.
UPDATE 8/8 @ 8:56am - Chono apparently had some swelling in the area under his left ear. He also managed to walk on his own from the clubhouse to the taxi that took him to the hospital last night.
Chono will not be traveling with the team today and will instead return to Tokyo for a full examination.