Jessie J may be forced to mime on stage due to her heart condition.

The condition mentioned is Wolff-Parkinson-White syndrome, which Jessie was diagnosed with at the age of 11.

Jessie J's heart condition may force her to mime on stage.

The 26-year-old chart topper has revealed she has been warned by doctors she needs to slow down on the amount of fast-paced shows she performs to maintain her health, which has posed a difficult dilemma for the star because she doesn't want to have to lip sync at her gigs.