The 'Last Night' singer-songwriter hurt her back in the incident on Friday night (August 31), reports The Sun.
However, she refused to go to hospital as she was on the way to a gig.
Spraggan was due to perform at The Viaduct in Leeds when she collided with a bus, but she avoided any serious injuries.
A source said: "She's in pain but is battling through it."
The singer previously joked that she has often been involved in accidents, saying: "Not dying so far is probably the best thing I've achieved."
Lucy Spraggan recently told Digital Spy that she will not "go out of control" on The X Factor.
She entered at number 11 yesterday (September 2) with her track 'Last Night' in the UK singles chart despite being removed from iTunes midweek.