The 21-year-old singer is reportedly upset because she does not want to keep singing cover versions on the show. Spraggan auditioned with her own material, and also performed original track 'Mountains' during the first live show of the series.
"Lucy might quit - she's tired of being told off," an insider claimed to The Mirror. "She doesn't want to sing covers. She was loving it but she's unwell, which is making her negative."
The insider also claimed that Spraggan wants to "be paid for the songs which she wrote that are selling on iTunes".
However, a show spokesperson has insisted that Spraggan "is very happy show-wise", while another source claimed that she is simply "still feeling unwell".
The X Factor has claimed in an official statement that "Lucy is committed to the show and is hoping to return to perform this coming weekend".
Spraggan was excused from performing this week as she had flu and was too ill to sing.
Watch Lucy Spraggan performing 'Mountains' on The X Factor below:
Photo gallery - 'X Factor' Halloween week results show:
Copyright: Ken McKay/Thames/Rex Features