Flamingo President Don Marrandino said her Tuesday-through-Saturday shows are also off, and Braxton will take advantage of a previously scheduled two-week break.
She is due to resume her show at the Flamingo Showroom on May 6. The Flamingo is offering refunds for the canceled shows.
The exact cause of Braxton's chest pain hasn't been made public. She has been treated in the past for pericarditis, a viral inflammation of the heart.
Braxton is a six-time Grammy winner for songs including "Un-break My Heart." Her Las Vegas act, "Toni Braxton: Revealed," is in the midst of a two-year run at the Flamingo.
