The 39-year-old singer was hospitalised after she collapsed on her way to the 'X Factor' press conference and her chauffeur rushed her to the hospital, reported Daily Mirror.
Mel B was ordered to take rest but she returned on the show yesterday telling fans she felt "better-ish".
Fans expressed their concern on Twitter after the 'X Factor' judge was hospitalised.
The doctors have performed lots of tests but the reason behind her illness has not been revealed yet.