Todd Helton's stomach problem is a mystery no more.

The Rockies said Tuesday the first baseman has been sidelined with acute terminal ileitis, an inflammation near the end of the small intestine. Team internist Dr. Allen Schreiber said he has prescribed more rest for the five-time All-Star before having Helton begin light exercise.

Helton, 32, was hospitalized Friday with stomach pain and released Monday to rest with his family.

Helton was placed on the disabled list retroactive to April 20 and will not be eligible to return to the active roster until May 5. However, the team said there is no timetable for him to come back.

This season, Helton is hitting .347 with one home run and nine RBI. He went on the DL last year for the first time in his career with a strained calf.