World welterweight champion Manny Pacquiao of the Philippines has been admitted to 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 Monday that doctors discovered the 31-year-old boxer had an ulcer during a routine checkup Sunday and his family convinced him to stay on in a suburban Manila hospital for a few days. Pacquiao's mother, Dionisia, told The AP her son was well and may be discharged from the hospital later Monday or Tuesday. Pacquiao won a seat in the Philippine's powerful House of Representatives, which he will assume on June 30. His promoters are also eyeing a possible bout with Floyd Mayweather Jr. or another fighter as early as November.