Representative Steve Scalise, wounded by a gunman on a baseball field on Wednesday, is likely to endure multiple operations as surgeons try to stanch bleeding and repair the damage to his internal organs.

Officials at MedStar Washington Hospital Center said that the bullet, fired from a rifle, entered Mr. Scalise’s left hip and tore across his pelvis, cracking bones and injuring internal organs.

On Thursday, he underwent a second surgery for internal injuries and a broken leg. Doctors said his condition was critical but improving. He is expected to remain in the hospital “for some time,” according to a hospital statement released Thursday night.

It’s the kind of trouble trauma surgeons see often, and they have learned though bitter experience how best to deal with it.