Manny Pacquiao was admitted to a hospital to treat a stomach ulcer Sunday, according to published reports.

Pacquiao's chief of staff Jayke Joson told the Associated Press that Pacquiao's doctors found an ulcer during a checkup on Sunday.

Pacquiao recently won a seat in the House of Representatives in the Phillippines.

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"Really, Manny can only rest if you confine him to a hospital," Joson said to the AP. "It's been so intense a campaign, he missed some of his meals." 

Talks between Top Rank and Mayweather Promotions for a megafight between Pacquiao and Mayweather are expected to begin soon.