MANILA, Philippines — World welterweight champion Manny Pacquiao has been admitted to a hospital to treat a mild stomach ulcer and allow him to rest after campaigning for the May 10 congressional elections.

Pacquiao's chief of staff, Jayke Joson, said today that doctors discovered the 31-year-old boxer had an ulcer during a routine checkup yesterday and his family convinced him to stay at a suburban Manila hospital for a few days.

Pacquiao won a seat in the Philippine's powerful House of Representatives, which he will assume June 30.